Microsoft is now rolling out Windows 10 build 19613.1005 as cumulative update KB4558320 for computers enrolled in the Fast ring of the Windows Insider Program. This is the preview number 17 releasing to testers, and it’s a minor update with no major changes.
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.