Total Spaces 2 license invalid

I have several copies of Total Spaces 2 and 3. I booted 10.10.5 and tried to run Total Spaces 2 and it would no longer accept my license key. How can I use Total Spaces 2 on my older system?

Your license should still work on 10.10 yosemite although it is very old at this point. Maybe try a fresh uninstall - re-install of TotalSpaces2 ? This can help because sometimes the binary does not validate correctly if something got corrupted. Use the uninstaller present in the DMG you downloaded from our website.