The registration Model Number pop-up menu only shows options for the
Macintosh Performa 6400/180 and 6400/200, which are very similar to your computer. This software was originally introduced on those computers, but the release of the Macintosh Performa 6360 and Macintosh Performa 6400 Video Editing System followed soon thereafter.
For the purposes of registration, choose one of the Macintosh Performa 6400 options. Although the software was inadvertantly not updated for your computer, this will not affect your registration process. Also, you do have the correct software bundle for your computer.