Yes,  you can easily switch from DDRC-24 to 2x4HD and back to DDRC-24 by loading the appropriate firmware to the unit. Steps should be as follow for say a DDRC-24 downgrade to 2x4HD: Update the firmware to the 2x4HD firmware, Open the 2x4HD plugin and restore to default. Your unit will now be a 2x4HD . Note that we don’t refund upgrade licences.