Windows 10 October 2020 Update now out....
Lets hope it fixes things for the egpu community and 8GB cards!
i may give this a shot before reformatting and going back to an older build of windows. an update a couple weeks ago completely broke my macbook pro bootcamp egpu support. i'm on the verge of just buying a proper windows machine given how miserable this experience has been.
Not sure if the October 20H2 update differs any from the September 20H2 update (which requires the Hackflags 0x600 work-around).
Or maybe running Windows Update Advisor might lead some to a working Windows build, as suggested by @eden188
The issues i was having were the Error 12 ones and this edition looks like they have updated the pci.sys to the one in the early beta's that resolved it.
In the end my Air wasn't powerful enough to drive the 8GB card properly so i did what @winnertakesteve is thinking of doing - built a Windows box.
Didn't know there where more issues 🙁