Ahhh. Okay.
See, the 'info' on the download page says:
Quote* The difference between the safe and the regular distribution.
The safe distribution contains an installer that will work with PHP safe mode enabled.
Apart from the size, the only difference is that you can only install YaBB SE in the directory you uploaded it to. Some systems have experienced trouble installing the safe mode version because of the limitations of safe mode. If you do experience said troubles, make a post on the Installer Help board or the Converter Help board and someone will assist you shortly.
So I read 'an installer' and naturally thought it was yet another web based installer. A little confusing.