I don't think that is correct. If you purchase an upgrade, you are upgrading to a newer version and you can no longer user the old one. There was a lengthy discussion on this about the time Whil Hentzen and Microsoft got into a "disagreement" over using VFP in Linux.
>Yes you are eligible for upgrade to VFP9. Yes you can continue to use VFP8 after installing VFP9.
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer