In a word the EULA says you can't transfer a license to a different PC, but it hasn't been tested in a court yet. People have transferred an OEM license and activated it. So it can be done, but the question about it being legal might vary by nation as Germany allows it if other nations do not.
But since it hasn't been tested in a court yet, nobody can say how legally binding it is or is not.
Agreed on not tested and my philosophy with legal grey areas is to avoid being part of the test case... However, these specific images come with their own EULA that says that you can not apply a different license to them (I checked because I would have also liked to have done so if it were allowed).
Just use this as they suggest for testing. Keep your data elsewhere and roll back/re-install every few months.
