very easy to install
you do have to have Java on your system (but everyone does already or should)(any java version 6, but thats been out for like 10 years, so if you hava java, its probably version 6)
yes there is an AI, two actually, as we have developed a new AI but kept the old one on just in case. they are decent at land campaigns
TripleA, as it is a fully legal version, does not ‘ship’ with any maps that may irk shark-suited lawyers at hasbro or other companies. Just like any other computer game out there in the world, people can make mods for it. The developers of TripleA also do not host any maps themselves. There is an AA50 map/mod out there, though you must download at your own discretion and make sure you own the game in real life, blah blah go ask a lawyer. If hasbro shows up at your door at midnight with some lawyers and baseball bats, and breaks one of your kneecaps for you having AABattleMap of Axis & Allies on your computer, and breaks the other for you having some user-created Axis & Allies maps for TripleA on your computer too, its not my fault and i prohibit you from complaining.
TripleA has a downloading utility that comes with the game, where you can put in the url of a site that hosts maps, and it will list and allow you to download them.
Just open up the game, click download maps, put this link in, and press list maps:
http://sites.google.com/site/veqryn/documents/TripleA_Maps.xml