Website has Fatal error – Hilfe benötigt

Hi,
habe folgendes Problem:

WordPress-Version 6.1.1
Aktives Theme: Enfold (Version 4.5)
Aktuelles Plugin: (Version )
PHP-Version 8.0.27

Fehler-Details
==============
Ein Fehler vom Typ E_COMPILE_ERROR wurde in der Zeile 313 der Datei /mnt/web023/d3/08/59480808/htdocs/WordPress_SecureMode_01/wp-content/themes/enfold/functions-enfold.php verursacht. Fehlermeldung: Unparenthesized a ? b : c ? d : e is not supported. Use either (a ? b : c) ? d : e or a ? b : (c ? d : e)

Habe im Forum gelesen, dass ich Enfold Updaten muss. Habe ich gemacht wie hier beschrieben:
Update via FTP
Log into your FTP account using an FTP program like FileZilla.
Locate the WordPress installation folder and browse to wp-content/themes.
Extract the theme files from enfold.zip and rename the enfold folder to enfold-new
Upload enfold-new folder and Enfold child theme to wp-content/themes/
Rename enfold folder (older version) to enfold-old and rename enfold-new to enfold
To confirm please check the version number in Enfold > Theme Update
Check if update went well. If it did, delete enfold-old folder. If it did not, rename enfold to enfold-new and enfold-old to enfold to revert to older version

Die Seite läuft aber immer noch im Wiederherstellungsmodus :-(
Nun steht folgendes oben:

Deprecated: Die Funktion Class avia_style_generator wurde mit einem Argument aufgerufen, das seit Version 5.3 veraltet ist! Trying to set protected/private property: avia_style_generator::print_extra_output – will become unavailable in a future release. Check for a set method or a filter. in /mnt/web023/d3/08/59480808/htdocs/WordPress_SecureMode_01/wp-includes/functions.php on line 5667 Warning: Cannot modify header information – headers already sent by (output started at /mnt/web023/d3/08/59480808/htdocs/WordPress_SecureMode_01/wp-includes/functions.php:5667) in /mnt/web023/d3/08/59480808/htdocs/WordPress_SecureMode_01/wp-admin/includes/misc.php on line 1416 Warning: Cannot modify header information – headers already sent by (output started at /mnt/web023/d3/08/59480808/htdocs/WordPress_SecureMode_01/wp-includes/functions.php:5667) in /mnt/web023/d3/08/59480808/htdocs/WordPress_SecureMode_01/wp-includes/functions.php on line 6865 Warning: Cannot modify header information – headers already sent by (output started at /mnt/web023/d3/08/59480808/htdocs/WordPress_SecureMode_01/wp-includes/functions.php:5667) in /mnt/web023/d3/08/59480808/htdocs/WordPress_SecureMode_01/wp-admin/admin-header.php on line 9

Keine Ahnung was ich nun machen soll :-( Könnt Ihr mir bitte helfen?
Vielen Dank schon mal