The second 10 banks of available presets was implemented with the release of the current software, 2.0.3. You will have to access System Mode (press and hold Encoder and Tap switch until Tap switch and Active LEDs are flashing). Turn Encoder until you see Banks the press it once. In this menu you will able to adjust the bank you would like to begin at and the highest bank you would like to access; it could be any combo you desire.
Please reference the TimeFactor Release Notes for 2.0.3 on the TimeFactor Support page for additional information of improvements and fixes in this version.