When I am trying to start the service on the PCs W7 and W10, I am receiving the error message.
1053 Le service n'a pas repondu assez vite a la demande de lancement ou de controle
Which installation directory did you use for Veyon? Maybe some special characters with accents etc.? Can you try to set the log level in Veyon Configurator to "Debug" and look for VeyonService.log in C:\Windows\Temp?