Hi @davidprince ,
Have you checked that the Windows Update service setting is set to Automatic (delayed)?
Click on the Windows Start button, left side of Taskbar and then type ''services'' into the search box.
Click on the Services app and when in services scroll down to find the ''Windows Update'' service (alphabetical list).
Double click on the entry and check the startup type is set to Automatic (delayed start).
If you change the setting click OK.
Next go to ''Windows Start > Settings > Update and Security > Windows Updates'' and click on the ''Check for Updates'' link.
Make sure that you're online when you do this.
It may take a little while and if downloads are available then they will be very big. In the GB range.
Apologies if you’ve tried this already.
If still no good here’s a [https://www.bleepingcomputer.com/news/microsoft/how-to-download-the-windows-10-1909-iso-from-microsoft/|link] that shows how to download and install Win 10 ver.1909