Dambusters

[DEBBIE 2]

Please can anyone help. I am trying to install backup of dambusters add on pack to MS Combat sim 2 it is safe disc 2.51 and will not seem to load past st up screen. I used clone cd to backup and have tried every safe disc program. I can back up safedisc versions but always have to use crack what i cant understand is why an add on will not work as it it only copies files and only needs original combat disc to run any ideas.

Please help.