I created a account, downloaded Ritmix and logged in, everything was working fine. I closed Ritmix, when I went to reopen it and login is says “Authentication Failed” and there is a “Purchase Here” option. I thought this was free software?
RitMix is free.
Being able to post here i guess you activated your account.
Have you tried logging in again. Maybe there was a typing error in your credentials.
Also, did you check the “Remember Me” checkbox?