Can't install cumulative updates

Hello! I would like to know what are the ways to update Windows to the latest build without using Windows Update? I have been unable to install the "Cumulative Updates" for a few months due to error 0x800f0991. I have tried running the image repair commands through CMD but it did not resolve. I have also tried installing the updates through the standalone installer downloaded from the Microsoft Update Catalog.
Any help is appreciated!