In my experience, changing drivers often, specially going back and forward with versions, can wreck system to the point of reinstalling it being only option.

Here are famous Omega drivers: Detail
they used to work well on W10 and maybe MS will update them to latest.

Where did you find it ? I can't, on the other hand I already did Disk Cleanup, maybe that's why.

Windows update downloaded it, I suppose it can be found on MS site.

Just received and installed an update for GPU driver, it's 15.201.1151-150821a-188665E working fine.

Yes. it's safe, as a matter of fact sometimes it's the only way.
BTW. I collected many AMD drivers from long time ago, if you need a specific version I can send it to you.

Baring HW issues and considering many drivers were tried, maybe you should clean up all the leftovers with : Download Display Driver Uninstaller - MajorGeeks in safe mode and than try to install...