Please check 4.4.17. (Slight fix for PHP 8.1, I don’t think it will be fully compatible).
after the update I got the following errors in the debug:
[19-Jan-2024 14:55:43 UTC] PHP Deprecated: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in /www/htdocs/blog/wp-content/plugins/wp-appbox/inc/getappinfo.class.php on line 341
[19-Jan-2024 14:55:43 UTC] PHP Warning: Undefined array key “style” in /www/blog/wp-content/plugins/wp-appbox/wp-appbox.php on line 701
[19-Jan-2024 14:55:43 UTC] PHP Warning: Undefined array key “style” in /www/htdocs//blog/wp-content/plugins/wp-appbox/wp-appbox.php on line 701
[19-Jan-2024 14:55:43 UTC] PHP Deprecated: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in /www/htdocs//blog/wp-content/plugins/wp-appbox/inc/getappinfo.class.php on line 341
[19-Jan-2024 14:55:49 UTC] PHP Deprecated: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in /www/htdocs//blog/wp-content/plugins/wp-appbox/inc/getappinfo.class.php on line 341
[19-Jan-2024 14:55:56 UTC] PHP Deprecated: unserialize(): Passing null to parameter #1 ($data) of type string is deprecated in /www/htdocs//blog/wp-content/plugins/wp-appbox/inc/getappinfo.class.php on line 341
PHP 8.1 deprecates these calls, it does not make them errors.
I’ll have a look, PHP 8.1 has deprecated passing null as parameters to a lot of core functions. However, this will not happen in the short term for private reasons.