Thank you for all the effort on CoolRead, it is the best and most stable of all the alternatives I have tried.
A fast question with respect to this info from the FAQ above:
"Standard fonts in native membranes Kindle
Corrected for the correct operation of the native Kindle fonts shell (rename (written by the scheme below) is not required)."
Please explain a bit here: where to put the files from the corrected archive and what is the problem these fonts solve.