The expansions work but not the base game? You have a serial that start with COMS? We are aware of the issue.
Steam has stopped giving out these codes now, but for those of you who bought the game some time ago and now want to register, here is what you can do:
Open a ticket at http://paradox.zendesk.com/
Say that you have a COMS code and include these things:
- Your code.
- A screenshot from within Steam where we can see the code as well as your account name.
- The receipt that Steam e-mailed you.
When we see these things, we will send you a code back. Note that the code will be valid for EU3 Complete, as that is what Steam actually gives you. The httt and dw code they also give you works fine.
If your code doesn't start with COMS, please make sure you've selected EU3 Complete from the list of games when registering before you contact support.