Facing issue while downloading

[malware908]

I uploaded the addon and now facing this issue when i click install i get this error

Oops! We ran into some problems.
Error: Class "\CAS\Setup" not found in src/XF/AddOn/AddOn.php at line 494
XF\AddOn\AddOn->checkRequirements() in src/XF/Admin/Controller/AddOnController.php at line 866
XF\Admin\Controller\AddOnController->getAddOnWarningsAndErrors() in src/XF/Admin/Controller/AddOnController.php at line 399
XF\Admin\Controller\AddOnController->actionInstall() in src/XF/Mvc/Dispatcher.php at line 362
XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 264
XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 121
XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 63
XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2824
XF\App->run() in src/XF.php at line 814
XF::runApp() in admin.php at line 15