Since the new version of waypoint has been released i still havent been able to download it i get the same message saying the xbox live marketplace bla bla bla as I said in a thread not too long ago where i tried all the suggestions and still no cigar. Please post a support link to 343i since i get no help on the forum.
Have you tried deleting the OLD version of Waypoint, clearing your 360’s cache, recovering your profile from Xbox LIVE and then try re-downloading it?
Also, what country are you from?