Buy the game Age of Empires II (2013) formerly known as AoE II HD on Steam. If you already own Age of Empires II – The Conquerors Expansion, you should purchase Age of Empires II Definitive Edition instead. After purchasing AoE II HD, you have to follow this article and if you already own AOC, you follow this article in order to get a working installation. Please follow the directions exactly on that page and you should have no problems getting started. Most common problems, if any, are fast proxy and disconnection issues which can be resolved easily.