Depends on your camera. If you have a CGO3 or CGO3+ you will have to use the "CGO" app. If you have a the older CGO2 you have to somehow get your hands on the CGO2 app, which ist not available anymore. If you have an Android device you are still able to find the APK on the Internet. I am not sure about Apple.
You have to give permission for it to install because it is not from the PlayStore. Go into your Android Settings and allow it to install apps from unknown sources. You can return that setting to off after installing the app.