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The Mac edition is produced by Virtual Programming www.vpltd.com , not Paradox. As I understand it they have a "CD key" that you use on installation, and the quite separate Paradox forum registration key. I'm guessing the one you refer to is the former, as that format doesn't fit in here. You ought to have a forum key too, that Steam supply.
 
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Similar problem here. I bought EU3 complete, HttT, and DW and received a forum code for EU3C and DW but not HttT (only a game code for that one). It doesn't seem to be a big deal, but my game won't properly connect to Paradox Connect (it connects but tells me that I'm running an edited game). I'd be happy to send my CD code for HttT to prove I purchased it (or just forward the email).
I'd appreciate any help, but I understand that you don't want to do this for every Mac user...

I'll check in with vpltd.com to bug them; I need them to release the patches for Mac anyway.
 
If you are having any kind of technical issue with the Mac version you need to check with them anyway.