This is where kobopatch.sh looks for the kobopatch binary and the patcher itself looks for the firmware zip. merge-kfmon.sh also looks for KFmon.tgz (the KoboRoot.tgz for Kute File Monitor, renamed). Download links for these are below.

Kobopatch: https://github.com/pgaskin/kobopatch/releases
Kobo firmware: https://pgaskin.net/KoboStuff/kobofirmware.html
KFMon: https://www.mobileread.com/forums/showthread.php?t=274231