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1. Go to your Steam Library and right-click your Doom 3 game showing in your list of games.
2. Hover your mouse over Manage and then left-click CD Keys to see the Product Code for Doom 3.
3. Either manually copy the Doom 3 Product Code onto a piece of paper, or left-click the Copy Key to Clipboard bar and then paste it on a document such as MS Word that you can print and keep for future use.
4. Start your RoE game again and manually enter your Doom 3 Product Code/Key in the pop-up area asking for the Doom 3 CD Key.