@Tex2002ans
In your 2020:
"OCRing + EPUBing my first book: Tips?" link, you mention Scan Tailor Advanced.
The only release I could find that has an install file is v0.9.11.1 from 2014.
https://github.com/scantailor/scantailor/releases
Is this the same software you are referring to? It seems quite old, and you mention generational leaps to the OP, so I wonder if the same applies to this software.
There is a v0.9.12.1 from 2016, but there does not seem to be any install file associated with that release.