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Hello to everyone,
Is it possible to transfer the game (SoC, or CoP) from GOG to Steam?
This question / problem has been solved by Lazarus_03image
No, it only works the other way around - Steam CD key to GOG.

Best you could do is add it as a non Steam game to your library.
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Lazarus_03: No, it only works the other way around - Steam CD key to GOG.

Best you could do is add it as a non Steam game to your library.
How add Steam key to GOG ?

is write "Invalid code"
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gilgamesh9: How add Steam key to GOG ?

is write "Invalid code"
On your library select Stalker then CD Key.

For Shadow of Chernobyl follow or [url=http://steamcommunity.com/app/4500/discussions/0/611702631229033549/]this.

Some keys work, some don't. It's hit or miss.
Maybe the code must be ANSI (or UTF-8) capital letters and numbers, not Unicode.