I haven´t had any problem in installing BB1 or BB2 on any of my computers or any of my friends and I haven´t used the emergencydisk on any of my installations. Maybe it has to do with that I have installed WB3.1 first and then 3.9 on that and then BB1 and directly, without reset, BB2 over that. I used both BB´s from Haage&Partner and not the one from Amiga. Don´t know if they are different but just maybe they are. :-)