Best software for cam programming

I changed computers and no longer able to access files from my V21 . I legally paid and have receipt. I saved all my work there since 2004. They pull the rug from under my feet. I called and they said I need to buy the latest upgrade $$$$. This is black mail, so I'm now their hostage. My V21 license is supposed to be perpetual. This will really hurt me financially and risk loosing it all. I am open to your advice. Thank you.