Try turning your Space off and on with the middle footswitch pressed. That should launch it in update mode, and you'll see 'UPDATE' on the screen. See if you can attach it to the computer that way and have it recognized by your computer. You'll most likely be able to update it using the Direct Updater after doing so.
If you are working on Windows, we could also send you an alternative updater you could try; please send us an email at email@example.com, and we could send you a download link for that updater.