Problem installing September 17, 2018—KB4464218

Hi, dalchina and Bree,

Thank you guys very much for your kind concern to help me. I will read the in-place upgrade post and as dalchina said I hope that I'll not be forced to re-install everything.

I'll backup all my files before going on with the in-place upgrade.

Thanks guys again

I don't know whether this is going to be helpful to anyone but I thought that I ought to post it.
Update was repeatedly failing on an installation on one of my machines. When I checked through the settings, Delivery Optimisation "Allow downloads from other PCs" was turned on. On my main machine, I use Disk Cleanup to clear out Windows Update data. So I turned off "Allow downloads from other PCs" on a just-in-case-basis and that fixed the problem.

Sorry, I didn't try. I rarely use that machine.