I succesfully install cubase, elicenser works and my licence is registreted. But the main installation seems not to work, basically the application does not started yet. It says “Installation prepared…”. Can please someon help mes

Try running it as the administrator, see link below. But it Sounds like something went wrong with the install. Try uninstalling, maybe even getting a new download, then reinstall as Admin and install for all users. C-drive is the best choice, as Steinberg does not support non C-drive for the program and .dll’s. However It is good to use the library manager to install instruments and content on other drives.