Yea it was long ago, as i said i was still a newbie with iso's. And I've never heard about sbi
If what u mean is getting the full game for quake u need the quake binaries zipfile from DCemulation and then search urself for the Pak1.pak for the full game, tis about 60 mb I think. Place it where the pak0.pak is also located (0 = only ep 1). See it as .pak is for quake what .wad is for doom. Strangely I never found the file on downloaded quake full games... instead I used some search sites just to search the .pak and succeeded