https://obsproject.com/forum/resources/obs-virtualcam.539/
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How to Install without installer:
1.Go Github Release to find zip file
2.Unzip OBS-VirtualCam2.0.1.zip and put it to your obs-studio install folder
3.Run CMD as Administrator and register 32bit directshow source
ex: regsvr32 “C:\Program Files (x86)\obs-studio\bin\32bit\obs-virtualsource.dll”
4.Do it again to register 64bit directshow source
ex: regsvr32 “C:\Program Files (x86)\obs-studio\bin\64bit\obs-virtualsource.dll”