Bitlocked "Windows 8 To Go" failed

[admin]

I have now removed Bitlocker and tried "Windows To Go Upgrader" again:

Now I am getting a "winhv.sys-problem"as Windows 8 To Go starts to boot (see screenshot 1).

If I start the "Windows To Go Upgrader"-VM directly in Virtualbox, I am getting a "BLKCACHE_IOERR"-Error (see screenshot 2), which appears to indicate that "write-access" is needed. (https://4sysops.com/archives/virtualbox-...te-access/)

Are you sure your program works? 

Please accept our apologies for any inconvenience we have caused.
It seems that you have installed Hyper-V role in the Windows To Go Workspace, Hyper-V is not available in a VirtualBox VM, so can you try disabling the Hyper-V role in the Windows To Go Workspace and see if it makes any difference?