As clieos already pointed out, you must manually flash your 8GB clix2 with the Rhapsody software. Once this is done, however, you will be able to use the iriver Firmware Updater for all future updates.
One word of caution. Before you flash your clix2 with the 1.14 Rhapsody firmware, make sure that you read
this thread. Unfortunately, there are some major bugs in the latest version of the firmware. Version 1.11 appears to be more stable, but you will only have access to 4GB of your player's memory.