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Not sure if you really tried, but Steam accepts older keys as well, just try.
If it does not work, and you want the game on Steam, you will have to buy a new copy.
I've been getting an "Invalid Product Code" error when I try to put in the key. Is it because it's a 16-digit CD key that I'm having this issue?
There a 3 formats for product codes, the system will tell you the format you need when adding a game.
If the code does not work, you will have to buy a new copy.
Still, if you enter the key and it says "invalid code", then the key isn't in the Steam database so it's not a Steam-redeemable key. There really isn't a lot of useful research since you already know the end result anyway.
- Be aware of Letters & Numbers, example 1 for L, 5 for S, O for 0, and so on.
- The keys has to be for Steam in order to work, otherwise it's not a Steam key, as just gives you error for invalid.