ok i made Huge progress... I've backup / uninstall / delete nebtempr.. / reinstall but with no success... Still listed in my daw and no action when opening the plug.
I've uninstall / reinstall my daw. No success... But Studio One kept of course settings in user profile.
So : I've deleted 2 settings files in studio one to force Studio to do a fresh scan : vstblacklistsettings (wich was empty) and vstplugins. This forced Studio one to make a fresh plugins scan. And bingo : it worked.