It's not an upgrade because there's no old version on the new OS. You might try installing an older version and see if the works then. But I'm afraid you'll need to pay for a new license if you want to have 2 copies on 2 different OS'es.
What happens if you run the Vista program from your Windows 7 OS? Just browse to it in Windows Explorer or Computer and doubleclick. I expect an error, but it's an interesting experiment nonetheless.
Installed and newly formatted a 1TB hard drive. Installed Windows 7 Home Deluxe) on it. Still have Vista Ultimate on the other hard drive.
MS Office is installed on this other drive.
How to I reload the Office on my new drive?
When I try to install the Office it says there's not an upgradeable program on my system.
How can I reach the MS Office program without going through the Vista OS?