I moved my PHP version down to 7.4 and it downloaded perfectly. Then I changed it back to 8.4 in my Web Control Panel. Let others know.

so in total : replace the snippet by:
( btw. i changed the code on my page too – if you hover the snippet there is on top right of the codeblock a copy button)

/**
 * Enfold Masonry Caption Fix - NUR für Perfect Grid
 * Schiebt die Caption unter das Bild, ohne es zu verdecken.
 */

function enfold_masonry_perfect_grid_caption_fix() {
?>
<style>
    /* ========================================
       PERFECT GRID CSS
       ======================================== */
    
    /* Erlaubt der Caption, über den Container hinauszuragen */
    #top .av-masonry.av-fixed-size.av-masonry-gallery .av-inner-masonry,
    #top .av-masonry-gallery.av-masonry-gallery-fixed figure.av-inner-masonry {
        overflow: visible !important;
    }
    
    /* Positioniert die Caption direkt unter das Bild-Quadrat */
    #top .av-masonry.av-fixed-size.av-masonry-gallery .av-inner-masonry-content,
    #top .av-masonry-gallery.av-masonry-gallery-fixed figcaption.av-inner-masonry-content {
        position: relative !important;
        top: 100%;
        background: #ffffff; /* Hier ggf. deine Wunschfarbe für den Hintergrund */
    }

    /* Korrektur für Tablets */
    @media only screen and (min-width: 767px) and (max-width: 989px) {
        .responsive .av-masonry-gallery .av-masonry-entry .av-masonry-entry-title + .av-masonry-entry-content {
            display: block !important;
        }
    }
</style>
    
<script>
    (function($) {
        'use strict';
        
        function fixPerfectGrid() {
            // Nur für Masonry Galerien mit festem Raster (Perfect Grid)
            $('.av-masonry-gallery.av-masonry-gallery-fixed, .av-masonry.av-fixed-size.av-masonry-gallery').each(function() {
                var $gallery = $(this);
                var columnCount = 1;
                
                // Spaltenanzahl ermitteln
                if ($gallery.hasClass('av-masonry-col-2')) columnCount = 2;
                else if ($gallery.hasClass('av-masonry-col-3')) columnCount = 3;
                else if ($gallery.hasClass('av-masonry-col-4')) columnCount = 4;
                else if ($gallery.hasClass('av-masonry-col-5')) columnCount = 5;
                else if ($gallery.hasClass('av-masonry-col-6')) columnCount = 6;
                
                if ($gallery.hasClass('av-masonry-col-flexible')) {
                    var $items = $gallery.find('.av-masonry-item-with-image:visible');
                    if ($items.length >= 2) {
                        var firstTop = $items.eq(0).offset().top;
                        var itemsInFirstRow = 1;
                        for (var i = 1; i < Math.min($items.length, 10); i++) {
                            if (Math.abs($items.eq(i).offset().top - firstTop) < 10) {
                                itemsInFirstRow++;
                            } else { break; }
                        }
                        columnCount = itemsInFirstRow;
                    }
                }
                
                // Maximalhöhe der Captions finden, damit die Zeilen gleichmäßig bleiben
                var maxCaptionHeight = 0;
                $gallery.find('.av-masonry-item-with-image').each(function() {
                    var $caption = $(this).find('figcaption.av-inner-masonry-content, .av-inner-masonry-content');
                    if ($caption.length && $caption.is(':visible')) {
                        maxCaptionHeight = Math.max(maxCaptionHeight, $caption.outerHeight(true));
                    }
                });
                
                // Abstand unten einfügen, damit das Masonry-Layout Platz für die Caption lässt
                if (maxCaptionHeight > 0) {
                    $gallery.find('a.av-masonry-entry, .av-masonry-item-with-image').css('margin-bottom', maxCaptionHeight + 'px');
                }
            });
            
            // Layout neu berechnen
            $('.av-masonry-gallery.av-masonry-gallery-fixed, .av-masonry.av-fixed-size.av-masonry-gallery').isotope('layout');
        }   

        // ========================================
        // INITIAL LOAD - Nur auf Bilder warten, nicht auf die ganze Seite
        // ========================================
        (function() {
            var $gallery = $('.av-masonry-gallery');
            
            if ($gallery.length && typeof $.fn.imagesLoaded === 'function') {
                // Wartet NUR auf die Bilder in der Galerie
                $gallery.imagesLoaded(function() {
                    setTimeout(fixPerfectGrid, 200);
                });
            } else {
                // Fallback für den Notfall
                setTimeout(fixPerfectGrid, 600);
            }
        })();

        
        // Nach Enfold Events
        $(document).on('av-masonry-complete', function() {
            setTimeout(fixPerfectGrid, 250);
        });
        
        // Bei Größenänderung
        $(window).on('debouncedresize', function() {
            // Reset Margin
            $('.av-masonry-gallery.av-masonry-gallery-fixed .av-masonry-item-with-image, .av-masonry.av-fixed-size.av-masonry-gallery .av-masonry-item-with-image').css('margin-bottom', '');
            fixPerfectGrid();
        });
        
    })(jQuery);
</script>
<?php
}
add_action('wp_footer', 'enfold_masonry_perfect_grid_caption_fix', 999);

i also replaced the on load event by:

// Run initially
$(window).on('load', function() {
    $('.av-masonry-gallery').imagesLoaded(function() {
        setTimeout(fixAllMasonryModes, 200);
    });
});

and implemented the enfold debounceresize function on performance reasons.

sometimes the way via youtube api v3 does not work – even if you have connected your billing details with that api.

place a snippet to your child-theme funcions.php:
– Registering the shortcode for the descriptive text (without api use – and google costs ;)

/**
 * Final Version: Fetches YouTube description and converts links correctly
 * preventing double-tagging or broken HTML.
 */
function get_yt_description_final($atts) {
    $a = shortcode_atts(array('id' => ''), $atts);
    if (empty($a['id'])) return 'Video ID missing.';

    $v_id = esc_attr($a['id']);
    
    // Use a fresh cache key to overwrite the broken HTML in your database
    $transient_key = 'yt_desc_v3_clean_' . $v_id;
    $description = get_transient($transient_key);

    if (false === $description) {
        $response = wp_remote_get("https://www.youtube.com/watch?v=" . $v_id, array(
            'user-agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36'
        ));

        if (is_wp_error($response)) return 'YouTube connection error.';

        $html = wp_remote_retrieve_body($response);

        if (preg_match('/"shortDescription":"(.+?)"/', $html, $matches)) {
            $description = $matches[1];
            
            // Decode unicode characters
            $description = json_decode('"' . $description . '"');
            
            // Clean up backslashes before storing
            $description = stripslashes($description);
            
            set_transient($transient_key, $description, DAY_IN_SECONDS);
        } else {
            return 'Description currently unavailable.';
        }
    }

    // 1. First: Escape the raw text to be safe from XSS
    $safe_desc = esc_html($description);

    // 2. Second: Convert URLs into clickable links using a more precise regex
    // This regex matches URLs starting with http or https
    $pattern = '~(?<!["\'>])\bhttps?://[^\s()<>]+(?:\([\w\d]+\)|([^[:punct:]\s]|/))~';
    $clickable_desc = preg_replace($pattern, '<a href="$0" target="_blank" rel="nofollow">$0</a>', $safe_desc);

    // 3. Output the result
    return '<div class="yt-desc-box" style="white-space: pre-wrap; word-break: break-word; background:#f9f9f9; padding:20px; border-radius:5px; border:1px solid #ddd; height:350px; overflow-y:auto;">' 
           . $clickable_desc . 
           '</div>';
}
add_shortcode('video_description', 'get_yt_description_final');

after that – place a shortcode under your embedded video:
[video_description id="youtube-ID"]

see: https://webers-testseite.de/videos/
( there you can easily copy&paste the needed code – and see examples )

because i do not believe that this is GDPR konform – i block it til you accept to see the youtube video.

well this wordpress login screen is not influenced by the themes installed !
This is a pure wordpress setting – so you have to check where it might be set a different Login Page.

i often make an own settup for it by this snippet for child-theme functions.php:

function custom_loginlogo_url($url) {
  $url = get_site_url();
  return $url;
}
add_filter( 'login_headerurl', 'custom_loginlogo_url' );

function my_login_logo(){ 
$logo = avia_get_option('logo'); 
?>
<style type="text/css">
    #login h1 a, .login h1 a {
      background-image: url(<?php echo $logo; ?>);
      height: 120px;
      width: 320px;
      background-size: contain !important;
      background-repeat: no-repeat;
      background-position: center top;
      position: relative;
      left: 50%;
      transform: translateX(-50%);
    }
    body.login {
      background-image: -webkit-radial-gradient(circle farthest-corner at center center, #B8E1FC 0%, #231421 100%) !important;
      background-image: radial-gradient(circle farthest-corner at center center, #B8E1FC 0%, #231421 100%) !important;
      background-repeat: repeat;
    }
    body.login form {
      background: rgba(255,255,255,0.2);
      box-shadow: 0 0 15px rgba(0,0,0,0.3);
    }
</style>
<?php 
}
add_action( 'login_enqueue_scripts', 'my_login_logo' );

you see in the snippet that the logo you set in the logo input field of enfold will be dynamically inserted there. If you like to have a differente one – then insert an absolute url on that place: background-image: url(<?php echo $logo; ?>);

this is then the look for it:

this is i think the best option to handle the lang files:
it is a only manual patch vor those lang files of LayerSlider.
Or automatic after Plugin Update
Just uploading the lang-files to /wp-content/plugins/LayerSlider/assets/locales folder

You will have than a button on the LayerSlider Admin bar:

/* ========================================================================
 * LayerSlider: Patch for Select Option of lang files
 * Auto-copies language files from uploads to plugin directory
 * Auto-removes language files that were deleted from uploads
 * Auto-patches after plugin updates
 ======================================================================== */

// 1. Patch-Function
function child_theme_patch_layerslider_template() {

    if (!defined('LS_ROOT_PATH')) {
        return false;
    }

    $template_file = LS_ROOT_PATH . '/templates/tmpl-plugin-settings.php';
    
    // Check both locations
    $plugin_locales_dir = LS_ROOT_PATH . '/locales';
    $upload_dir = wp_upload_dir();
    $custom_locales_dir = $upload_dir['basedir'] . '/layerslider/lang';
    
    if (!file_exists($template_file)) {
        return false;
    }
    
    // Create custom locales directory if it doesn't exist
    if (!is_dir($custom_locales_dir)) {
        wp_mkdir_p($custom_locales_dir);
    }
    
    // SYNC language files (copy new/updated, delete removed)
    child_theme_sync_language_files($custom_locales_dir, $plugin_locales_dir);
    
    // Find available languages (now from plugin directory after sync)
    $available_languages = child_theme_get_available_languages($plugin_locales_dir);
    
    if (empty($available_languages)) {
        return false;
    }
    
    $content = file_get_contents($template_file);
    
    // language names
    $language_names = [
        'de_DE' => 'Deutsch',
        'de_DE_formal' => 'Deutsch (Sie)',
        'de_CH' => 'Deutsch (Schweiz)',
        'de_CH_informal' => 'Deutsch (Schweiz, Du)',
        'de_AT' => 'Deutsch (Österreich)',
        // add lang names needed for your uploaded lang files
    ];
    
    // protected default languages 
    $protected_languages = ['auto', 'en_US', 'fr_FR', 'hu_HU', 'uk'];
    
    $modified = false;
    
    // PART 1: Adding missing languages
    $new_options = '';
    foreach ($available_languages as $locale) {
        if (strpos($content, 'value="' . $locale . '"') !== false) {
            continue;
        }
        
        $language_name = isset($language_names[$locale]) ? $language_names[$locale] : $locale;
        $new_options .= "\n\t\t\t\t\t\t<option value=\"" . $locale . "\" <?php echo ( \$custom_locale === '" . $locale . "' ) ? 'selected' : ''?>>" . $language_name . "</option>";
        $modified = true;
    }
    
    if (!empty($new_options)) {
        $search = '<option value="auto" <?php echo ( $custom_locale === \'auto\' ) ? \'selected\' : \'\'?>><?php _e(\'Site default\', \'LayerSlider\') ?></option>';
        $replace = $search . $new_options;
        $content = str_replace($search, $replace, $content);
    }
    
    // PART 2: Removing languages that no longer exist
    foreach ($language_names as $locale => $name) {
        if (in_array($locale, $protected_languages)) {
            continue;
        }
        
        if (strpos($content, 'value="' . $locale . '"') !== false && !in_array($locale, $available_languages)) {
            $pattern = '/\s*<option value="' . preg_quote($locale, '/') . '"[^>]*>.*?<\/option>/';
            $new_content = preg_replace($pattern, '', $content);
            
            if ($new_content !== $content) {
                $content = $new_content;
                $modified = true;
            }
        }
    }
    
    if (!$modified) {
        return true;
    }
    
    // Save
    file_put_contents($template_file, $content);
    
    return true;
}

// 2. IMPROVED: Sync language files (copy new + delete removed)
function child_theme_sync_language_files($source_dir, $target_dir) {
    
    if (!is_dir($source_dir) || !is_dir($target_dir)) {
        return false;
    }
    
    $copied = 0;
    $deleted = 0;
    
    // PART 1: Copy new/updated files from source to target
    $source_files = glob($source_dir . '/LayerSlider-*.{mo,po}', GLOB_BRACE);
    
    // Get list of locales in source directory
    $source_locales = [];
    if ($source_files) {
        foreach ($source_files as $source_file) {
            $filename = basename($source_file);
            $target_file = $target_dir . '/' . $filename;
            
            // Extract locale from filename
            preg_match('/LayerSlider-([^\.]+)\./', $filename, $matches);
            if (isset($matches[1])) {
                $source_locales[] = $matches[1];
            }
            
            // Copy if doesn't exist or is newer
            if (!file_exists($target_file) || filemtime($source_file) > filemtime($target_file)) {
                if (copy($source_file, $target_file)) {
                    $copied++;
                }
            }
        }
    }
    
    // Remove duplicates
    $source_locales = array_unique($source_locales);
    
    // PART 2: Delete files from target that don't exist in source
    $target_files = glob($target_dir . '/LayerSlider-*.{mo,po}', GLOB_BRACE);
    
    // Protected locales (never delete these - they're from the plugin itself)
    $protected_locales = ['en_US', 'fr_FR', 'hu_HU', 'uk'];
    
    if ($target_files) {
        foreach ($target_files as $target_file) {
            $filename = basename($target_file);
            
            // Extract locale from filename
            preg_match('/LayerSlider-([^\.]+)\./', $filename, $matches);
            if (!isset($matches[1])) {
                continue;
            }
            
            $locale = $matches[1];
            
            // Skip protected locales
            if (in_array($locale, $protected_locales)) {
                continue;
            }
            
            // If this locale is NOT in source directory, delete it from target
            if (!in_array($locale, $source_locales)) {
                if (unlink($target_file)) {
                    $deleted++;
                }
            }
        }
    }
    
    return ['copied' => $copied, 'deleted' => $deleted];
}

// 3. Helper function
function child_theme_get_available_languages($locales_dir) {
    $languages = [];
    
    if (!is_dir($locales_dir)) {
        return $languages;
    }
    
    $files = glob($locales_dir . '/LayerSlider-*.mo');
    
    if (!$files) {
        return $languages;
    }
    
    foreach ($files as $file) {
        $filename = basename($file, '.mo');
        $locale = str_replace('LayerSlider-', '', $filename);
        if (!empty($locale)) {
            $languages[] = $locale;
        }
    }
    
    return $languages;
}

// 4. Insert button in dashboard
function child_theme_layerslider_add_sync_button() {
	$screen = get_current_screen();
	if (!$screen || strpos($screen->id, 'layerslider') === false) {
	    return;
	}
	?>
	<script type="text/javascript">
	    jQuery(document).ready(function($) {
	        setTimeout(function() {
	            if ($('.ls-sync-languages-button').length > 0) {
	                return;
	            }
	            
	            var $settingsButton = $('.ls-open-plugin-settings-button');
	            
	            if ($settingsButton.length === 0) {
	                return;
	            }
	            
	            var syncUrl = <?php echo wp_json_encode(add_query_arg('ls_sync', '1', admin_url('admin.php?page=layerslider'))); ?>;
	            
	            var $syncButton = $('<a>', {
	                href: syncUrl,
	                class: 'ls-button ls-sync-languages-button',
	                html: '<?php echo addslashes(lsGetSVGIcon("globe")); ?>'
	            });
	               
	            $settingsButton.before($syncButton);
	            
	        }, 500);
	    });
	</script>
	    
	<style>
	.ls-sync-languages-button:hover {
	    color: #fff;
	    background: #54575f;
	    border-color: #0000;
	    transition: opacity 0.2s;
	}
	</style>
	<?php
}
add_action('admin_footer', 'child_theme_layerslider_add_sync_button');

// 5. MANUAL TRIGGER
function child_theme_layerslider_manual_sync() {
    if (!isset($_GET['ls_sync']) || $_GET['ls_sync'] != '1') {
        return;
    }
    
    if (!current_user_can('manage_options')) {
        wp_die('No permission');
    }
    
    $success = child_theme_patch_layerslider_template();
    
    $redirect_url = admin_url('admin.php?page=layerslider');
    
    if ($success !== false) {
        $redirect_url = wp_json_encode(add_query_arg('ls_synced', '1', $redirect_url));
    } else {
        $redirect_url = wp_json_encode(add_query_arg('ls_sync_failed', '1', $redirect_url));
    }
    
    wp_redirect($redirect_url);
    exit;
}
add_action('admin_init', 'child_theme_layerslider_manual_sync', 1);

// 6. AUTO-PATCH after plugin update
function child_theme_layerslider_after_update($upgrader_object, $options) {
    if ($options['action'] !== 'update' || $options['type'] !== 'plugin') {
        return;
    }
    
    if (!isset($options['plugins'])) {
        return;
    }
    
    foreach ($options['plugins'] as $plugin) {
        if (strpos($plugin, 'layerslider') !== false || strpos($plugin, 'LayerSlider') !== false) {
            // Run patch automatically after LayerSlider update
            child_theme_patch_layerslider_template();
            break;
        }
    }
}
add_action('upgrader_process_complete', 'child_theme_layerslider_after_update', 10, 2);