Ok, so it would seem that either noone has encountered this problem before me, noone is interested in helping or the answer is something obvious that I should have seen, but didn't, or since using a VM isn't officially supported I'm on my own.
Anyway, for whatever it's worth I'm gonna post how I solved the problem, maybe it can help someone else when they encounter the same issue, or it will just get buried amongst the other threads in the forum.
What I did was to download the Windows 10 ISO File:
https://www.microsoft.com/en-us/software…ad/windows10ISO
Then i downloaded WinToUSB:
https://www.easyuefi.com/wintousb/
WinToUSB uses the ISO image to create a Windows 10 installation on the USB drive, you can then run Windows 10 directly from the USB drive. Doing that, I had no problems updating the firmware on the Octo and now it works just fine running Aquasuite X.47 on my Windows 10 VM under Linux Mint.
Hopefully this can help somebody else someday...until Linux support has been implemented this is one way of doing it.