Microsoft recently pushed cumulative updates KB4345421 (OS Build 17134.166), KB4345420 (OS Build 16299.550) & KB4345419 (OS Build 15063.1208) to Windows 10 version 1709 (Fall Creators update), version 1703 (Creators update) and version 1607 (Anniversary update). These updates bring only fixes and improvements for their Windows 10 versions. You can read more about these updates here.
While these updates will be available via Windows update automatically on your PCs, you can download them and update your PC manually too. We are providing direct download links for these updates below.