I have been having this problem for the past few weeks now, but whenever I have an optional update that I "can" install Windows Updater fails to install it. first it was KB 4566782, it gets to 100% downloaded, installs all the way to 100% in a pretty average speed, then tells me that it failed to install. the other one it is having trouble with is KB 4571744. Now, I have the same version of Windows 10 on both my desktop AND laptop and my laptop has installed all the updates, including previews, flawlessly yet my desktop can't install those 2 updates mentioned above. I have tried the troubleshooter (claims nothing is wrong), restarted the updater services, restarted the whole pc, downloaded directly from the windows catalog and nothing works. All I get is error code 0x800f081f to which I have tried googling and tried the other methods to install above. The only thing I can think of is running the windows repair tool but I don't want to spend that time being bored and trying to fix my computer when there might be something else to try.