Microsoft has today pushed new security patches Build 17763.832 (KB4520062) and Build 17134.1099 (KB4519978) to Windows 10 version 1809 (October 2018 update) and version 1803 (April 2018 update). These updates bring only fixes and improvements for their Windows 10 versions.
You can read more about these updates here. Provided below are the direct download links for these updates in case you need to do a manual install.
Build 17763.832 (KB4520062):
Build 17134.1099 (KB4519978)
If you need help in understanding how to install these updates manually on your PC, you can refer to our step by step noob-friendly tutorial here.