Registration instructions:

To register in any version, you need to hold Command (Apple) and Option (Alt) then press R during a game. For version 1.2.3, you can also register via the shareware notice by selecting Register w/AutoPay on the shareware notice, then on the Easy Registration app select Delayed Register > Enter unlock code in the menu bar at the top of the screen. Note that in v1.2.3, the name field has a space pre-populated that must be deleted.

Registration code for v1.2.3 and v1.3 (Untested on older versions)
Name: Moon Dark
Code: RECB