Like for all versions of Windows 10, Microsoft just released the servicing stack update KB4515530 for Windows 10 v1903. You can find the download links for KB4515530 update's offline installer down below.
The servicing stack is a quality update that is aimed at fixing the component(s) that is responsible for downloading and installing the Windows 10 updates. Unless you install the servicing stack update, you might not be able to install the recent or future cumulative updates.
As such, it is recommended that you install the update as soon as possible.
You can install the update directly from the PC Settings app. Just open the PC Settings app, go to "Update & Security → Windows Update" and click on the "Check for updates" button. Windows will automatically download KB4515530 update along with any other updates that are required for successfully installing servicing stack update.
If you've paused the update or having trouble using the Windows Update feature, you can manually download KB4515530 offline install for your machine and install it like any other software. This is particularly useful for offline machines.
Download KB4515530 Offline Installer
To make things easier for you, I found the direct download links for KB4515530 for both Windows 10 32-bit and 64-bit systems. Depending on your system type, download the update using below links and install it like any other Windows software. After installing, restart the system and you are good to go.
KB4515530 x86 (32-bit) offline installer (download size: 6.5 MB)
KB4515530 x64 (64-bit) offline installer (download size: 14.4 MB)
If you want KB4515530 download links for Windows Server or ARM64 based systems, go to the Microsoft update catalog website to find the appropriate links. All you have to do is click on the Download button next to the appropriate version.
Addresses an uninstall issue with automated maintenance. If the Features on Demand (FOD) feature has a language satellite installed, the feature is left in an unusable state. Additionally, the released language pack content is not removed even if it is superseded.
That is it.