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Download both files
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win-capture.dll goes into: C:\Program Files\obs-studio\obs-plugins\64bit\win-capture.dll
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graphics-hook32.dll goes into: C:\Program Files\obs-studio\data\obs-plugins\win-capture\graphics-hook32.dll
It works on OBS Streamlabs as well, just do exactly the same as @masterlooser18 said and replace these to files in the following paths:
C:\Program Files\Streamlabs OBS\resources\app.asar.unpacked\node_modules\obs-studio-node\obs-plugins\64bit
and
C:\Program Files\Streamlabs OBS\resources\app.asar.unpacked\node_modules\obs-studio-node\data\obs-plugins\win-capture