I was going to write something snarky about the social site earlier on, but got distracted. That said, it’s not THAT bad. You want the DLC, and it’s worth the effort. While it isn’t OMGWTFBBQ-awesome, a lot of it is pretty decent.
When you sign up with a Bioware account (note: if you use the same email as you do for EA’s Origin system or registering ME:2, it will be the same login), you’ll see tabs on the left. One of them says “my games” - make sure your game shows up as registered. It will have an option to “remove registration” if it has been.
Next, another tab will be labelled “profile” - this is where you add codes for prepurchased DLC, like what comes with DA:O Ultimate edition. I believe you need to go to “redeem promo code” from the list that opens up, and you enter the special code you got in the box to associate all DLC with your account.
Finally, make sure you have the game set to “run as admin.” Start it up, log into the game (and make sure you pick “remember my info” or whatever so you don’t need to remember) and then go to the main menu and click on “Downloadable Content” in pretty gold letters on the right hand side (btw - if anything in that menu is faded out, that means you’re not logged in). You can watch the download progress as it goes, and thankfully it’s pretty quick. Make sure nothing is showing up as “available DLC,” because that means it’s ready to be purchased, and you should have it all.
Once all downloads are complete, you can select (or leave unselected) various pieces of DLC at your liesure. Important note: this is the same menu that you would select or deselect mods.
troubleshooting:
Every once in a while, Bioware’s server regurgitates and shows various DLC’s as “unverified” or something to that effect. I still have no clue as to why, but I usually solve the issue by closing the game, manually shutting off the DAO service (enter “services” in your search bar, and disable it from there), logging into the social site and verifying your account didn’t vanish, WITHOUT LOGGING OUT OF THE SITE I then open up the game which simultaneously starts the service back up, and then if things don’t show as verified I will log out from the game menu and log back in. Oh, and you can then close the site.
Mind you, there are probably as many methods to work around that problem as there are sold copies of DA:O, but that one worked for me.