"No valid Windows installed"

Purchased, downloaded, installed "windows 10 recovery disk". Using neo tool, burned bootable USB. Booted, ran. Neither "C" drive (active Windows) nor "A" drive (clone of C) is considered by ERE as a valid installation. Huh?
I noticed after purchase that the Win10 version of ERE repairs thru "Windows 10 October 2018 Update (1809)". Am I SOL because I'm running 1903?

Correction: the laptop I'm trying to fix is 1803, not 1903. Also, I'm moving this to Recovery Disks, the correct thread