Highend theme not comatible with 8.0 PHP

I have multiple sites I designed with your Highend WP Theme. It seem that this Theme is not compatible with WordPress PHP version 8.0., preventing access in admin mode. Please advise at franktarsia@gmail.com
See error message:

When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.9.2
Current theme: Highend (version 3.7.6)
Current plugin: (version )
PHP version 8.0.17

Error Details
=============
An error of type E_ERROR was caused in line 181 of the file /nas/content/live/confluentweb/wp-content/themes/HighendWP/hbframework/vendor/class-theme-update-checker.php. Error message: Uncaught Error: Attempt to modify property “response” on bool in /nas/content/live/confluentweb/wp-content/themes/HighendWP/hbframework/vendor/class-theme-update-checker.php:181
Stack trace:
#0 /nas/content/live/confluentweb/wp-includes/class-wp-hook.php(309): ThemeUpdateChecker->injectUpdate(false)
#1 /nas/content/live/confluentweb/wp-includes/plugin.php(189): WP_Hook->apply_filters(false, Array)
#2 /nas/content/live/confluentweb/wp-includes/option.php(1957): apply_filters(‘site_transient_…’, false, ‘update_themes’)
#3 /nas/content/live/confluentweb/wp-includes/update.php(790): get_site_transient(‘update_themes’)
#4 /nas/content/live/confluentweb/wp-admin/menu.php(33): wp_get_update_data()
#5 /nas/content/live/confluentweb/wp-admin/admin.php(158): require(‘/nas/content/li…’)
#6 /nas/content/live/confluentweb/wp-admin/index.php(10): require_once(‘/nas/content/li…’)
#7 {main}
thrown