The problem is that I found about 3 or 4 topics about the sticky : "can't install bring down the sky 'cause I have no CD key".
Ok , according to our mutual friend Google , you have to sign in to Bioware Social and register your purchased copy of Mass Effect 1 and then , you will receive a valid activation key for the DLC.
After proceeding to Social Bioware , ( I didn't need to register , I already have an account ) I searched for Mass Effect 1 so I could register it and claim that activation key.Thing is , ME 1 it's not present on the list of games.
Return to Google.
After reading more posts and topics I have discovered that the only way you can actually receive an activation key for "Bring Down the Sky" is contacting a game advisor at EA Live Chat.
Good.
I contacted the game advisor , I explained to him that all I wanted was an activation key for the DLC and he kept saying that I should call a supervisor (I can't do that , I'm not from the States) , after telling him that I cannot do so , he proceeded to giving me a Skype number (free , not where I'm from) and call that number.And after that , the chat was interrupted.
Did I mention I had to wait 28 minutes for the advisor?
All I would like is a valid activation key , because the ones I found around here are already IN USE.