I don't know if it is specific to me, but I also have issues installing drivers in win10 for vega. I get one driver installation, after that something always goes wrong and I have to reinstall windows.
Awesome it's not just me. I have the same issue's that I get 1 installed fine anything after that it's a 50/50 chance that the driver installs correctly for the other 9 Vega gpu's. I haven't tried another driver yet besides the Aug23 blockchain driver. Have you? Trying to compare notes to see what else to test to try and get them hashing. I've spent WAY to much time on get more that 1 Vega GPU working...