So I need to have MC11 and MC12 running on every PC in order to upgrade?? I deleted MC11 on all my computers during the MC12 trial period. Plus I've installed two new PCs with MC12 exclusively. Why can't I just use my MC11 license key to activate the MC12 upgrade at $19? Please advise, thanks.
Actually, If you used MC11's unistaller it didn't remove your MC11 registration. The uninstaller removes everything else, but not the registration code. In that case MC12 should give the upgrade price automatically when the purchase process is started from the buy button inside MC (e.g. from the first splash screen).
If you used a registry cleaner tool then the old registration is not available when MC12 checks for that code.
As said, you can use the new key for registering the other PCs, so only one of the PCs must have a valid MC11 registration code installed (not necessarily the complete MC11 program).