ianymaty: Thanks for your response.
Actually, I did build my own using NTLite in February 2016, and it's worked well.
However, I'm now a little older (77) and I'm finding that the details of the process are becoming confusing. It wouldn't be so difficult if I was prepared to just throw every MS update into the mix, but I want to be more selective, and that entails vetting virtually every update since Feb 2016.
Hence my attempt to find a clean OS that someone else has prepared.
Hey, if I definitely can't find such a file, I'll be forced to have another go, but I'm not optimistic about the project :-)