Hey Jubilation,
That sounds like you may have accidentally installed the eSellerate version. It won't work with FastSpring keys so we'll want to get the FastSpring version installed and see if that fixes the issue. Just grab the correct OS for you below and let me know if that helps.
Win OS
http://cdnfiles.ootpdevelopments.com...fastspring.exe
MAC OS
http://cdnfiles.ootpdevelopments.com...fastspring.dmg
Thanks
Alex