Install the Gamelauncher in a directory of your choice.
After the first start you can commence an automatic search. The Gamelauncher tries then to find all your installed games.
The frontend of the Gamelauncher and all its supported games by default.
With the option 'search games' you can let it search for games automatically.
With right-click on the according game you can search by yourself for an install-path or correct it. Have in mind the checkbox must be marked, otherwise it won't work and your game won't launch.
The update-function is enabled by default. You can edit the update-interval in the options or turn it completely off. You can also start a manual update. There is only one search per each interval (daily, weekly or monthly) for updates. If there is a new program-version you will be informed and asked, if you want to update.