I've decided to open another topic, since I guess the problems with activation are gone (I just have to keep retrying, with the OA disk, not the Reinforcements one) until it acepted. Know it doesn't ask for it anymore.
The problem is that the DLCs aren't available ingame. An error message appears when I launch the game:
The game launches anyway. But I have no PMC or BAF new maps, missions and campaigns.
Failed to load file "pmc|addons|air_pmc.pbo" - decryption of headers failed.
If I go to the "Expansion" option in the main menu, both BAF and PMC are installed and enabled.
My guess is that error is related to this problem.
Is there a fix for this, please?