I have....
1.20 - Installed when i bought my computer, this is the JJ2 version that i make lvls from.... for some reason i can't patch it
1.24(both TSF and CC99) - LK Avalon version, downloaded from the internet, the version that i test downloaded lvls and also make lvls from TSF tilesets, and for Internet play
1.23 - Got it from my friend two weeks ago.... Also for internet play

And which versions do you have?

edit: you can tell me which version you most use and for what(like I done)