I hope it works, works fine on my end, I actually got it working on an old PC with 128mb gfx, 512mb ram and an intel pentium, mind that thing can somehow cope with windows 7 ok too, runs just as fast when it had vista or xp anyway, but MRise ran on it with those horrible specs so it should run ok on anything higher.
I wish I could get the download size smaller but I would have to start grinding noticeable quality to get there which would spoil MRise.
As for installing, if you've got a working GAE 0.3.1 set up, the core files contain tilesets, maps, faction resources but no factions and data that replaces the menu elements, it is necesary because of the resources for the factions it has. Then the factions contain a faction each.