I have the exact same problem, I just can't download expansion packs to my Sims 2 Double Deluxe. I went mad, so I kept reading the instructions over and over again. You know, maybe I was wrong?! ... Then I saw that on the back it says, 'You need The Sims 2, the special dvd-version of The Sims 2, The Sims 2 Christmas Pakket or Sims 2 Deluxe to play.
' It doesn't say anywhere that it will work on Sims 2 Dubbel Deluxe. I know you wanted help, but sorry.