Hello,
New install of this package onto J4.1 running on PHP8.0, and multiple issues to report:
- in Maintenance:Database
--Manifest reports 4.1.8, database version is at 4.1.0.

- in backend (/administrator/index.php?option=com_wallfactory&view=configuration)
--none of the options are saving, and if i Cancel i get "500 JHtmlJQuery::ui not found. / Return to Dashboard" error message.
With J! logging enabled, I get this when I click on 'Dashboard' (/administrator/index.php?option=com_wallfactory&view=dashboard) :
error - Uncaught Throwable of type InvalidArgumentException thrown with message "JHtmlJQuery::ui not found.". Stack trace: #0 /var/www/clients/client2/web2/web/administrator/components/com_wallfactory/helpers/dashboard.php(31): Joomla\CMS\HTML\HTMLHelper::_() #1 /var/www/clients/client2/web2/web/administrator/components/com_wallfactory/views/dashboard/tmpl/default.php(27): WallFactoryDashboard::renderDashboard() #2 /var/www/clients/client2/web2/web/libraries/src/MVC/View/HtmlView.php(431): include('...') #3 /var/www/clients/client2/web2/web/libraries/src/MVC/View/HtmlView.php(220): Joomla\CMS\MVC\View\HtmlView->loadTemplate() #4 /var/www/clients/client2/web2/web/administrator/components/com_wallfactory/helpers/backendview.php(51): Joomla\CMS\MVC\View\HtmlView->display() #5 /var/www/clients/client2/web2/web/libraries/src/MVC/Controller/BaseController.php(697): WallFactoryBackendView->display() #6 /var/www/clients/client2/web2/web/libraries/src/MVC/Controller/BaseController.php(735): Joomla\CMS\MVC\Controller\BaseController->display() #7 /var/www/clients/client2/web2/web/administrator/components/com_wallfactory/wallfactory.php(28): Joomla\CMS\MVC\Controller\BaseController->execute() #8 /var/www/clients/client2/web2/web/libraries/src/Dispatcher/LegacyComponentDispatcher.php(69): require_once('...') #9 /var/www/clients/client2/web2/web/libraries/src/Dispatcher/LegacyComponentDispatcher.php(71): Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() #10 /var/www/clients/client2/web2/web/libraries/src/Component/ComponentHelper.php(389): Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() #11 /var/www/clients/client2/web2/web/libraries/src/Application/AdministratorApplication.php(143): Joomla\CMS\Component\ComponentHelper::renderComponent() #12 /var/www/clients/client2/web2/web/libraries/src/Application/AdministratorApplication.php(186): Joomla\CMS\Application\AdministratorApplication->dispatch() #13 /var/www/clients/client2/web2/web/libraries/src/Application/CMSApplication.php(278): Joomla\CMS\Application\AdministratorApplication->doExecute() #14 /var/www/clients/client2/web2/web/administrator/includes/app.php(63): Joomla\CMS\Application\CMSApplication->execute() #15 /var/www/clients/client2/web2/web/administrator/index.php(32): require_once('...') #16 {main}

As it stands, the package is unusable.
Any ideas ?

Id say it does cuz i'm having the same problem