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I'd prefer to add official support for DLC but I don't know when I'll have time to code it. At the moment there's no way to add multiple Steam keys to a project, but you can use the "Other" key slot to upload whatever you want. I think minimally I could add the ability for you to label what they are called and the you can say it's the key for the DLC.

OK thanks, for now I'll wait and see if meanwhile the DLC thing is implemented. Maybe before end of year :)