https://moviesanywhere.com/settings/connect -if you’re a Movies Anywhere user with 4 or less synced accounts, you can get Free Happy Feet, The Martian, and The Fate of the Furious Movie Downloads added to your account. You just have to sync to two new retailers in order to get them. If you don’t have accounts with these retailers you can register for free. The offer is mentioned here.
–Update– if you have already connected all your accounts be on the lookout for an email like this with a code to get your movies.