I planned on ordering The Walking Dead with a coupon code I got for pre-ordering Tales of Monkey Island. I see no reference to expiration or anything. The email states:
A Free Game (Choose your Poison): Why ye would be wantin' to play a game without pirates, I surely cannot fathom, aside from the fact that it won't cost you a doubloon. Use the coupon code to get a free episode of your choice from the Telltale store.
Must I wait until Walking Dead is actually released? If not, why am I getting an invalid coupon code error? I tried copy/pasting so I know it's accurate. Thanks!