Here:https://www.youtube.com/watch?v=4RCcaPMld-8
I know is an older version , but the steps should be the same.
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CristianVlad - - 3 comments @ SPV3.3.0 Release
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CristianVlad - - 3 comments @ Portal 2: Displacement First Open Alpha!
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to work just go to the Portal 2: Displacement on soucemod and open gameinfo and edit the value SteamAppId ex 333 to 620 and it will work
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