You might want to consider these addons as well:
Kobo Start Menu (KSM8), offers some tweaks and utilities as well as being able to launch KOReader, Coolreader, and the Vlasovsoft Launcher. (The Coolreader port is included in the Vlasovsoft Launcher, but KSM can include it as a separate menu item.)
The Vlasovsoft Launcher, includes Coolreader, File Manager, OPDS alpha, Chess, Checkers, Sokoban, Reversi, Gomoku, Takuzu, Sudoku, Dictionary, Notepad, Calculator, UsbNet, WiFi, Reboot and Power off.
KOReader, a multi-platform eReading program with an improved PDF reader that has a builtin OCR function and reflow. KOReader also includes a number of features to work with calibre and make good use of Wifi. In addition to its PDF reader it implements the Coolreader 3 Engine (cr3) for a wide number of formats including .epub, .mobi, .pdb, .fb2, and others.
An install guide.
The KOReader Forum here at MR.
The KOReader WiKi at Github.
Luck;
Ken