Hi all.
Allow me to step in here to clear up a little bit 
The video is more about the functionality of the app itself then the connection. We use ad hoc only as an example.
Thank you mr.roos for your extensive report. It shows how hard troubleshooting a network based service can be. Whole books have been written about this (network service troubleshooting), so please understand that we can not help everyone with connectivity issues.
Some more points:
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No ad hoc network is required. We suggest this in the video because it is the most simple form of network and to get all other network factors out of the equation.
But in general you should be OK to use an existing wifi network. As stated abovet: every network is different, it is literally impossible to factor everything in a tutorial. Its not in our hands, we can not know your networks, simple as that. -
The USB driver quoted above has nothing to do with Cubase IC pro.
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Bonjour is not required if you use ip addresses instead. Bonjour will enable automatic discovery.
Here is how to find out your IP address:
Find your IP address in Windows - Microsoft Support
Please discuss the app related content of the tutorial for the rest of the topic.
If anyone has connection issues please open a new topic and work with article first:
https://www.steinberg.net/en/support/knowledgebase_new/show_details/kb_show/cubase-ic-pro-troubleshooting