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I have both Doom 3 and Doom 3 BFG Edition in my library so I was wondering why the store doesn't say Doom 3 is in my library and let's me purchase it. Is the version on the store newer/different? Thanks.
This question / problem has been solved by pabloduskimage
Do you happen to own Doom 3 from the Amazon giveaway? That's a different catalog item but it's all the same version. At least it shows a warning if you try to buy it, "Please note that DOOM 3 is already included in DOOM 3 - Amazon Prime which you own."

There are other annoying cases like this that GOG really needs to get their act together on.