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Would be nice if somebody could fix that because I don't want to register my copy of EU:Rome.

Why not? I'm just curious.
 
Okay I registered my copy of Rome. Well tried at least but the same mistake occured. Invalid HoI Anthology Key. Frackin' great Pdox. I am proud of you. I am now seriously reconsidering my policy towards pirating instead of buying Pdox games.

All right and the server is busy. Great move. Thats the right way to turning off long time costumers.
 
Just to confirm, have you emailed gamersgate support for help, or posted in the gamersgate support thread.

bearing in mind that over the weekend there will likely be no one around at Paradox HQ to answer questions.

Cause from here at least it sounds more like a gamersgate problem.