You can download it without a registration key but it says since it is a major revision it needs a registration key when you run the firmware updater. I have downloaded both the updater and the firmware. I can not procede without the registration key.
It only needs a key if it is a major revision. There have been no major revisions for the BR330T, so you do not need a key. Major revisions are indicated by an advance of the main version number (i.e. when v1.x.x goes to v2.x.x). The latest firmware for the BR330T is 1.03.06