Might have been a temporary site problem... What browser are you using? Have you tried clearing the browser's cache, cookies, history etc? Or trying a different browser? Works for me when Win 11 is selected from the drop-down menu using Firefox.
Checking for drivers using 'Check for Updates' (SupportAssist) does not find any downloads. Checking for drivers using 'Find Drivers' NO LONGER allows me to search for Windows  11 drivers . SupportAssist - v 3.14.0.91 OS - Windows 11 22H2 Build(22621.1635) [IMAGE]  
Unable to Manually Check for Drivers