Windows 10 Update Failures

Hi, please try these two elementary steps first, in the hope this will be easy to resolve:
a. Run the Windows Update Troubleshooter

1. On your keyboard, press Windows Key+I. This should open the Settings app.
2. Go to Update & Security, the select Troubleshoot from the menu on the left pane.
3. Select Windows Update, then click Run the Troubleshooter.

Post a screenshot of the result

2. Reset Windows Update in Windows 10 | Tutorials

3. Run
chkdsk c: /scan
from an admin command or powershell prompt and post the result. (This is just a check, it fixes nothing).

4. You may find it helpful to get an 1809 iso so you don't have to keep downloading about 4Gb.
To start the upgrade attempt:
- Mount the iso (rt click, click mount) Mount will not be available if iso is not associated with file explorer
- Open the new drive created
- Run setup.exe from there

5. Please check you have at least 25Gb free on C:

6. Disable or uninstall any security software when upgrading.

7. Opt not to accept updates when you make the upgrade attempt

8. Disconnect any unnecessary peripherals, esp. wireless.

Reattempt the upgrade and advise any error messages exactly as they appear.

If it fails again, @zbook will probably be along and ask you for a lot more information, including the log files.
If it does fail again, as a matter of routine, please run
SFC /SCANNOW
from an admin command or powershell prompt and advise the summary result.