no video

Looks like you've already tried quite a bit - helpful data here!

Have you tried toggling off or switching a few of the default advanced video settings in Zoom yet? Areas I would try A/B-ing are highlighted below:

https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0066515

Thank you for your fast reply. I have tried to do what you suppested, it did not help (
Any other ideas?

I would like to try and install an older verion of Zoom, something like 4.6.12
Where can I get it?

You will be able to use anything older than 5.13.5 due to Zoom's Quarterly Lifecycle Policy:

https://support.zoom.com/hc/en/article?id=zm_kb&sysparm_article=KB0061130

You can find old versions of Zoom for Windows here, but need to use 5.13.5 or newer in order to connect to calls:

https://zoom-us-zoom.en.uptodown.com/windows/versions

Note that the link above is not an official Zoom website.

I also had some problems with this but I  tried some steps, Ensure your camera is selected correctly in Zoom settings. Update Zoom and verify camera permissions in Windows settings.