Once all settings are configured, click "Setup" (or "Apply"). The tool will apply the image, write the boot loader, and integrate your drivers. Once finished, you simply restart your computer to begin the final Windows OOBE phase.
Therefore, there is no official GitHub repository for the tool's source code. The official home for WinNTSetup is the MSFN (Microsoft Software Forum Network) forum, where its sole developer, JFX, maintains the project and releases new versions. This is where you'll find the official downloads and the most reliable information. winntsetup github
WinNTSetup includes a "Tweaks" dialog where you can disable Cortana, disable the Recycle Bin confirmation dialog, turn off telemetry, skip Microsoft account requirements (for Windows 11), and even disable the Modern Standby (S0) issue. Once all settings are configured, click "Setup" (or "Apply")