What squirrely posted is an old problem, known since release. I've had to resort to it myself a couple of times. First of all, it can be necessary to have it Run as admin, DAUpdater.exe.
Secondary, the old DAUpdaterservice.exe (or however it was called) - it no longer seems to exist, at least on Origin. So downloading ingame is no longer possible, because you needed exactly that service. And they apparently didn't bother to replace it with something else, while Origin's counterchecks make no sense - it's still missing a lot of DLC, and saying I don't have some DLC that I in fact have.
Third... ensure the .DAZIP-files get downloaded as what they are, DAZIP. Depending on your settings and system it might annoyingly convert it automatically to .ZIP-files, which won't work.
If you manage to get to the old forums, you also can find an long help list there in the Tech forums... An stickied thread which they didn't bother to convert to Answer EA, yet is as helpfull as it can be, which contains information regarding a long list of possible errors etc and solutions. Personally, my cookies atm prevent me from returning to the old forums, but there are still ways.