Error message 204 on downloading Acrobat DC

I have had Acrobat DC on my laptop for some time, when suddenly and recently it no longer worked.

I finally reverted to uninstalling it and reinstalling - and that is where things stopped.

On initializing the download, I get the Error 204.

Running it on a Dell XP13 laptop with Windows 10. All other Adobe Suite works just fine.

I cannot find anywhere what I need to do to fix what is wrong.