If you pay $15, you get also GM:S Export Modules for iOS, Android, HTML5, Windows UWP.
Additionally you get some games, including GM:S Source Code for the games.
This version of GameMaker Studio Pro is Windows-only. However, there are rumours
about GM:S 2 coming soon, and rumours say it is for Win/Linux/Mac.
Maybe this version of GM:S will not get additional updates anymore, after GM:S 2 is out.
Don't know, but maybe someone here is interested anyway (for $15 ).
I used GM around 12 years ago when Mark Overmars still had it. At that time it was a runtime module written in Delphi that interpreted Mark's scripting language and Mark had a clever way of creating a single executable for distributing your games - it combined the runtime and script together and packaged it as an exe, removing any need to distribute a Delphi compiler. I continued to use it for a while after YoYo Games bought it but dropped it after having myriad troubles with their software protection scheme. In fact, when I started experiencing problems, I began to look for another tool I could use to create 2D games and that led me to my favorite development tool today, PureBasic. I know that many other longtime PB coders have followed a similar route to get here. Fred has YoYo Games to thank for at least a part of PB's success imho. They alienated a lot of people with that stupid protection scheme.
Popular software tools run their course and die out or just plain piss off their customers (Blitz, Powerbasic, GameMaker to name a few) and Frédéric Laboureur, the original Energizer Bunny, is right there, johnny-on-the-spot to gobble up the disenfranchised users like some inexhaustible Pac-Man. Twenty years from now it'll probably be the same. World domination in slow motion, one domino at a time.
I bought the package for $15 a couple of days ago. I used it back in 2000/2001. It's a cool app but has it flaws. While the app runs on Windows, you can compile your games on OS X and Linux. You just have to have access to those operating systems. The iOS and Android plugins are nice for those who want to develop for mobile devices and can not in PureBasic. Either way, $800 dollars of software for $15 isn't bad. I never would have paid the original amount as I find that a bit high. I may or may never use it but couldn't pass up the deal, just in case.
Don't ever buy the OS X version that's available on the Mac App Store. It's buggy and hasn't received updates in a long time.