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Is it possible to install PTV Visum including Python with a Silent-Installation?

Yes, since PTV Visum 2020 that is possible. Refer to the Installation Manual in:
c:\Program Files\PTV Vision\PTV Visum 2021\Doc\Eng\Installation_Visum2021.pdf
Ch. 5.

If you want to install Service packs for PTV Visum later it is possible to package them, even if they exchange any Python components of the Python installation or inside the Visum installation folder.

For PTV Visum 18 and earlier release versions:
Unfortunately, Python can not be installed in the background because the setups for Python are not 'silent' and are not created by PTV.
Although you can use a manual setup to create a Setup.inf file to prepare for a silent installation, any Python components mentioned in the Setup.inf file will be ignored.
Packaging older releases is possible, but only without Python. If Python is needed, the setup needs to be run manually.