Windows 10 1809 gets a new SSU KB4493510. This Servicing Stack Update is available through Windows update automatically on build 17763.402 for Windows Insiders in the Release Preview ring. The KB note is yet to be published. However, you can download cab file for the SSUs via following links –
1) KB4493510 Windows 10 1809 64-bit (x64)
2) KB4493510 Windows 10 1809 32-bit (x86)
3) KB4493510 Windows 10 1809 ARM64
Get help of the following instructions – How to Install Cab Update via DISM in Windows 10
Cumulative update KB4490481 for the same version is released today.