you can manually download BUT the best option in my opinion is to run RECOVERY MODE
make sure you have ethernet cable in the sat - using DHCP from router. (use long network cable from router to satbox)
turn box off, ensure network cable is a working "internet" cable - power on, while holding in the front button
once in recovery mode, choose install from network (cant remember exact wording) - from there you can pick and choose from several E2 images and DEFINE, which you can install into any of the 4 slots.
this really isnt difficult once you know about the recovery menu