If you should've bought the game (which would be much more wise than downloading it) there is a way to have all episodes of 1.23 and 1.24 in one programm.

1. Re-install it.
2. If it asks you where you want to install JJ2 in, type in the same folder both times. For example, C:\Games\JJ2 TSF for CD1 (1.23) and CD2 (1.24).

Don't try that with OEM (your beta version) though. And if you follow Unknown Rabbit's advise, be sure NOT to copy the file anims.j2a into the TSF folder, otherwise the game will crash when you start it.

Hope that helps.