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>We have VFP 5 & 6 and I think the upgrade should work.
>The reason is I think the VFP 9 upgrade will check for versions as old as 6 so VFP 8 should also go back to at least 6.

Neither version of VFP upgrade checks for previous version of VFP on PC. IOW, you can install VFP upgrade on PC that never had any VFP versions installed.