tshering explained it to me once; all that is needed is to copy the "vlasovsoft" folder into the .kobo directory.
The same for KOreader, you copy over to .kobo the "koreader" folder, from the download zip.
For cr3 you will have to dig , the "vlasovsoft" folder out of the KoboRoot.tgz file inside the download zip file.
Luck;
Ken