Question

I forgot to forget the product key, and there is no way to find it again. Looks like it came out in 2011. "Studio one v1.6.4"

Answer 1

It's likely that you registered your product key to whatever email address you were using when you first purchased it. Try going to my.presonus.com , logout (if you are logged in), and try to login using a previous email address.

You can also use the "Forgot my password" function to find your old account's password.