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A script started over COM has crashed with error messages like:
- 'Communication with the Python background script failed'.
- 'Could not start the script component'.
- 'Could not find a matching script component for file extension '.py'.'
- 'pythoncom error: ERROR: server.policy could not create an instance.'

- Register the COM server again:
PTV Visum -> Help -> Register as COM server
(In case this needs to be repeated, start PTV Visum as Administrator.)
- Check the Python installation:
Windows Start button -> Settings -> Apps -> Python -> Change -> Repair Python -> Finish
(Older OS: Control Panel -> Programs -> Programs and Features)