[Fractint] Fractint compatibility

Hi all, Just wondering if this mailing list is still alive, I noticed the forums are not active, I hope people still use Fractint. A more practical question: I have v20 of Fractint and just installed v16. I’ve tried to run some of the formulas that come with v20 on v16: the main formulas (FractInt.frm) of v20 run fine on v16 however all the rest of the formulas under /frm do not run (I get error messages) - I thought there was compatibility, am I doing something wrong? Cheers!