Composer’s Mosaic version 1.53

I need to borrow the installation discs for Composer’s Mosaic version 1.53 by Sign of the Unicorn. I no longer use the program to set music, but the old MAC it’s on has some original compositions on it (by a composer who’s passed away) that need to be printed out and the program has corrupted. The noteheads are replaced by other symbols. I have the installation discs and a friend is loaning me a more recent MAC that will accept the program and be more dependable, but disc three turned out to be damaged. Because installation fails at disc three, we don’t know the status of disc four. Surely somebody has these program discs gathering dust and would be willing to loan them for a week or so?