Yeah but it looks like to be a fluke that hardly ever shows up.
I don't think you should bother the 99% of the users who don't install on Vbox with that remote possibility.
I cannot as the issue has completely vanished now i.e totally NOT reproduceable anymore.
exactly don't worry about that, the message only appear in the case that all of these checks happens:
- the message of "do not run installer twice" appears
- machine is a virtual machine
- more than 1 cpu is configured to it