Have you been able to check with the team? I am at the point where this DLC would kick in and I would like to finish the game with the updated ending.
We're still investigating this issue. I will keep the thread updated with any news.
Thank you for your patience so far!
I had this same issue and after chatting with EA Support they said if you have the latest version then the Extended Cut DLC is built into the game. That's why you won't be able to see it in the add-on section.
That just isn't true. I also spoke to EA support. Evidently they don't know what they're talking about.
I definitely had the latest version installed and the extended content folder was missing from the installation directory.
Fortunately I was able to acquire the DLC via other means, paste it in there and experience the full ending in all its glory.
For those having the same issue and want to finish the game without waiting an eternity for EA to maybe sort things out - I'd advise doing the same.