Windows 10 versions 1809, 1803, and 1709 have got UUP updates KB4514987, KB4512745, and KB4512744. The updates have been pushed to the users taking part in the Unified Update Platform preview. Microsoft is trying to improve the experience for differential updates by reducing the time this way for Windows computers and Mobiles.
All the 3 September 19 UUP preview updates are available on Microsoft update catalog for some time. However, this sent to the limited number of Windows 10 users who are participating in the Unified Update Platform testing program.
KB4514987, KB4512745, and KB4512744 UUP Update Windows 10 1809, 1803, 1709 19 Sept 2019
To install the updates navigate to the following Microsoft update catalog site link –