Clicking “Launch Gateway Utility” on Windows 10 via the start menu pops up the user account control confirmation window, and then nothing happens after confirmation. The only way I could actually bring up the gateway utility UI was via the “launch-gcu.bat” in “C:\Program Files\Inductive Automation\Ignition”.
The GCU (the UI version, anyway) is probably going to be removed. Going forward, I would suggest using the appropriate batch/shell files in your root install directory to start/stop the gateway, or to install/uninstall the service (Windows only). If you need GCU functionality like the ability to take thread dumps, use the command-line utility (gwcmd) instead.