Windows Update trying to install update that's already installed

Solution 1:

Already tried the following: Running the Windows Update Troubleshooter Running the Background Intelligent Transfer Service Troubleshooter (I know it's already built into Windows Update troubleshooter but I ran it independently anyway for good measure) Using dism, sfc and chkdsk (from the tuneup.bat file)

Now you need to try the Windows 10 Repair Install

https://www.microsoft.com/en-us/software-download/windows10

Windows 10 is running, so click on the Download button (not Upgrade Button) and select Run.

Start with the option to Keep Everything and see if that works (normally does).

If not, there are two more Repair options: Keep only Data and Keep Nothing. These are more invasive than the first option which leaves you where you started with errors corrected.