When Kodi is launched, Genesis ought to update by default. By going to the Kodi main menu and then selecting SYSTEM > Addons> Available Updates in Kodi 15 (or Check For Updates and then Available Updates in Kodi 14.2), you can manually force a Kodi Genesis update if the addon settings do not inform you that Genesis is at version 5.0.0 when you hover over it and press the menu button.