"Lastly, the upgrade license grants you rights to run Windows 10 in addition to the existing rights to run Windows 7.
The caveat is that you can only legally. per the agreement, run one OS on the one machine at a time. If you want to run the other OS, you must remove the upgraded OS from the machine, then install the previous OS"
Just found this on the Tenforums.com
Seems to clarify things.
Musiclover
Last edited by musiclover; 07/28/15 11:20 PM.