I have the exact same problem with the install complaining that my OS is not the correct version.  I'm on 64-bit Windows 10 Pro Version 2004 (OS Build 19041.450).

I'm using an i5-8400 with UHD Graphics 630 and it was working fine but I've been having a bad "flickering" (actually goes black and returns a second later every maybe... 20 minutes or so).

But, I made a big mistake and deleted the old driver before installing the new so now... I can't get a driver to install!  I tried about 5-8 versions going backwards, tried the latest Beta version - all of them tell me my OS isn't supported!

Please fix !

--------------update... an hour later

My issue resolved itself.  I rebooted and when I came back to the Driver & Support Assistant page (I'm not even sure why I went there... did my system prompt me to?).  It then showed that I needed a graphics driver update - so I followed the bouncing ball and for some reason, this time it installed fine (that page did NOT detect any issue with the driver earlier).

So... not sure why it was different (other than of course the reboot) but my issue is resolved now.