Koreader builds rely on some version of fmon, to launch the program. If you don't want the Coolreader or the games or the utilities that are included in the KoboLauncher, you can install fmon as a stand alone program:
https://www.mobileread.com/forums/sho...d.php?t=218283
And follow the instructions there. Then you can add Koreader following the guide.
Luck;
Ken