I just signed up and I'm not sure how to download maps to my gamertag from this website. When i click download, it doesn't seem to do anything but send me to the main page. What am I missing? Thanks for the help.
The 'Download' button doesn't actually allow you to download maps, because online file sharing is not possible in Halo 5 yet. The button is there in anticipation of online file sharing being added in the future (please 343). Maps can only be downloaded directly through Halo 5. You'll have to add the forger as a friend and locate them in your roster in Halo 5. If you press A on their name, you can access all of their files by selecting 'Map Variants'.
Let's be clear here. What a Chunk said is true for everything but Reach maps, with proper links. Reach maps with proper links only require you to log in to your Live account when redirected, because it has what we call a, real "File Share." It's no Bungie.net Reach File Share, but it's the closest we've had since. Happy map hunting.