akauper

That was the answer somehow... Set docker to 400G and it worked. No idea why. Even SpaceInvaderOne's video says 100G. But if anyone else comes here with the same issue there you go! Thank you ghost82!!

I made a 100G hard drive in the docker settings. Also tried it with a 200G harddrive, no luck. My array has terabytes of free space, so I don't think its that. But I've read that reply elsewhere about space. I will try to play with increasing disk size.

Hello, I'm able to get to the disk check utility and start the BigSur install. However, the install always fails with the error "An error occurred loading the update". I've tried removing dev/urandom, fresh installing macinabox, removing customovf, and everything else I can think of. Weird thing is, first time I installed macinabox and BigSur it worked just fine. I then deleted that vm because i was having (unrelated) problems and ever since then it has failed in the exact same way. Anyone have any ideas? Attached is the error and the installer log.