I had a quick look with the installed version of OBS that I have. It seems that this version of OBS needs the Spout plugin to be located in “C:\ProgramData\obs-studio\plugins”.
The Spout plugin installer creates a folder
“C:\ProgramData\obs-studio\plugins\win-spout”
I am not sure where the portable version of OBS requires plugins but there is a download that you can unzip to any folder win-spout-1.9.0-windows-x64.zip
Try extracting this in “obs-plugins/64bit” to get “obs-plugins/64bit/win-spout”
From my brief testing, the installed version of OBS doesn’t recognize the plugin when it is copied to there, but the portable version might.
Thanks for your efforts. I tried this and it worked independently of the installed version of OBS. For future reference I created a step-by-step instruction. Could you check that it is correct and complete.
Installing the Off World Live Spout2 plugin for OBS portable mode
The manual installation instructions above should help, but they can be replaced by a single batch file that does everything, This should be copied to the OBS portable root folder along with the Spout2 plugin zip file.
It will -
find a zip file starting with “win-spout”
if not found, prompt to download it
extract to to a “win-spout” folder
copy all the files as required
delete the extracted folder
Then it is ready to run. All tests are positive. Could you please test this, Download from here, copy to the OBS portable root folder and extract the batch file.