I purchased all five BTTF episodes last night. I installed them all without incident and played about a half hour of Episode 1 before going to sleep. Just now I clicked the desktop icon to play the game. It asked me to login, which I did, and then took me to the episode select screen. I choose Episode 1, and there is a "Play" button, but clicking on it results in absolutely nothing happening. No freeze or crash or anything, just absolutely nothing.