Indeed, it is the commercial version and the updated version provided through the support channels solves the issue.
Thank you!
Adding some details of the issues, when attempting to switch from PHP 7.4 to 8.2 the following error is thrown:
PHP Fatal error: Uncaught Error: Call to undefined function create_function() in /srv/example.com/httpdocs/wp-content/plugins/cp-multi-view-calendar/cp-multi-view-calendar.php:33
