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This has been tested with VideometerLab version 4.3.1:
https://portal.videometer.com/downloads/software
The zip file "VM.Lab.Session.ExternalSerialSessionController_5.0.3.zip" contains the ExternalSerialSessionController.
Drag and drop the file from zip into the installation folder.
The zip file "Python_5.0.3.zip" contains the Python class "VideometerLabDevice" and associated Python scripts.