Update KB4558320 doesn’t increase the build number, and according to the software giant, it’s a update designed to test the “servicing pipeline with builds from the Active Development Branch in the Fast ring.”

Download Windows 10 build 19613.1005

The preview is available immediately through the Fast ring. This preview build will download and install automatically on your device, but you can always force the update from Settings > Update & security > Windows Update, and clicking the Check for updates button. All content on this site is provided with no warranties, express or implied. Use any information at your own risk. Always backup of your device and files before making any changes. Privacy policy info.