Hmm. Not straightforward! Bit of a "meh" to have to stick to the 32 bit version, but on the other hand the 64 bit version is going to cause me extra grief. I guess that I will end up sticking with the 32-bit version.
The GUID issue means that I have to do the install - whether clean 64 or update 32 - into the existing VM. Is that right? Snapshots essential, of course, whichever way I play it.
Cheers
Stuart