The matter is opaque. I myself bought the part expecting it to be delivered with Windows 11, as mentioned in the product information. What I got was a barebone (no operating system). Digitec support was unable to give me any information or help in any way; apparently they themselves didn't know what they were actually selling. After consulting the manufacturer's website, I came to the conclusion that they only supply barebones.
In the meantime, Digitec has sold the device CHF 200 cheaper as a barebone. Now it is being offered again with the same description (i.e. supposedly with Windows 11), but CHF 100 more expensive than when I bought it. 849 francs for a PC without an operating system would be quite steep.
As I wanted to keep the device and put it into operation immediately, I had to help myself and get it up and running. In my review on the website, I described step by step how to do this. It was worth it for me.

Hi bruno, I'm still 'getting' with Digitec because no BS was included. Still waiting for a solution.
Greetings Efrem

It has no operating system installed.