Paths where we search for star catalogs does not seem to include the KNewStuff download destination on Windows
Based on an issue reported on the Facebook KStars users group, it appears that on Windows, the destination of the KNewStuff
Tycho-2/USNO NOMAD downloads does not figure in the search paths for star catalog resources. See https://www.facebook.com/groups/428163374611772/posts/1052701572157946/ -- manually moving deepstars.dat
to the same location as unnamedstars.dat
solved the issue.
I do not have access to a Windows machine to build and diagnose the problem. If someone does, that would be great.