The Gateway is managed by the Launcher, so make sure to install the Launcher first.
If the Launcher is properly installed, the Gateway can be controlled with the Gateway button in the toolbar. Press the button when you want to connect. If it's running, you will be connected immediately. If the gateway is not already started you will be asked if you want to start the gateway service.
If the connection is successful, the button will change status to Gateway connected.
The Launcher automatically updates the Gateway on start-up, so each time you access Simumatik you will be up-to-date!