Thanks Sarcas for your quick answers but yes "Accept new Hardware Devices" is enabled.

Hello there,
I am a beginner with both the Moroen plugin and Domoticz.
I installed Domoticz on Windows 10 20H2 (x64) as a test.
Version :
Domoticz: Version: 2021.1
Python (32b): 3.9.6
Git and Go installed and updated

I installed the plugin as follows:
- From GIT: git clone https://github.com ...