1. After you have downloaded the .zip file, you will see a folder named "maps" in there. Open Windows Explorer and go to "Program Files (x86)\Steam\steamapps\common\Portal 2". When there, you should see a bunch of folders. There should be a folder named "portal2", drag the "maps" folder from the .zip file into the folder "portal2". 2. You are almost done! Now start Portal 2. Go to Co-op and start a game with your friend or stranger. When you see the animation or the robot blueprint .gif along with steam sounds you have to open the console. In the console type "commentary 1", then to enter a map, type "changelevel mapname" for example, changelevel sp_a2_bts1.
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