Correction, we do not provide any scripts at all.
The Softaculous one click installer is a third party script handler that we have implemented in order to make it easier for our users to install scirpts for the site(s).
I just switched you to PHP version 8.0 and that seem to have brought your site back up. This means the update you made did require a newer version of PHP that you initially had activated. This is the most common reason for such error to occur, so before updating it is always wise to check that the requirements are met for the plugin/wordpress version you are upgrading to.