When setting up or customizing your handheld gaming device, you may encounter the message steam deck running install script . This process is completely normal and happens when installing or updating software, drivers, or third-party tools usually. The script runs automatically to configure files, apply updates, and ensure compatibility with the SteamOS environment. Depending on the size of the installation, it may take a few minutes to complete. Users should avoid interrupting this step, as doing so could cause errors or incomplete setup. Letting the script finish ensures smooth performance and a stable gaming experience on the Steam Deck.