Enfold no longer working after php update

As of a recent update to our hosting provider’s php version, our enfold theme no longer works.

It displays the error shown below on the main page.

I assume I need to update enfold. The person who set up our website has not worked here for years and he would be the only one with the code.

So I need a new code to get access to the updates.

Please let me know what you need in order to facilitate this.

Thanks,

Chuck Daniels

Fatal error: Uncaught Error: Function name must be a string
in /home2/ltathlet/public_html/wp-content/themes/enfold/framework/php/class-style-generator.php on line 123

Call stack:

avia_style_generator::create_styles()
wp-includes/class-wp-hook.php:287
WP_Hook::apply_filters()
wp-includes/class-wp-hook.php:311
WP_Hook::do_action()
wp-includes/plugin.php:478
do_action()
wp-includes/general-template.php:3006
wp_head()
wp-content/themes/enfold/header.php:47
require_once()
wp-includes/template.php:730
load_template()
wp-includes/template.php:676
locate_template()
wp-includes/general-template.php:48
get_header()
wp-content/themes/enfold/template-builder.php:12
require_once()
wp-content/themes/enfold/config-templatebuilder/avia-template-builder/php/template-builder.class.php:440
AviaBuilder::template_redirect()
wp-includes/class-wp-hook.php:287
WP_Hook::apply_filters()
wp-includes/class-wp-hook.php:311
WP_Hook::do_action()
wp-includes/plugin.php:478
do_action()
wp-includes/template-loader.php:13
require_once()
wp-blog-header.php:19
require()
index.php:17