I noticed that the Mac version is usually always a bit later then the Windows. Do you have to create a separate version for mac :) ?
Nope it's actually the exact same version/files etc. but to compile for OSX I have to boot up my ol' iMac which was bought specifically for compiling OSX versions. The trouble is that usually Apple has updated their operating system which forces me to upgrade, I also have to update Adobe AIR for OSX (using an older version would mean it wouldn't work with the newest OSX) and make sure all files are compiled correctly (unlike the Windows version you can't just add files to the binary file and get it going).
All in all it's a lot of work for no reason other than it being Apple and annoying.