So, Steam has software now- and has for a little while.

http://store.steampowered.com/app/220700/

Ace is on there, and it at its cheapest since ever(aside from the 2 for 1 box deal, but meh that's over now). That's 55.99(It's $70 retail now... remember when it was $90?) for the next 18 hours, which is still pricey- and also consider Steam DRM which... while it will make it easier to deal with than Ace's default DRM for using your program across multiple machines, you will have to be online to use Ace.

Just thought I'd toss this out here, since RPG Maker and all.