The 2nd edition of the OS3.9 cd is pink
If you have the first edition it has some bugs which one of them is that unarc produces corrupt unarchived files so if you unpack boingbag 1 with unarc it's likely that will cause a problem which you now have
but my guess is that you didn't create an emergency-disk and installed OS3.9 with it which install a compatible Installer tool
Copy "installer" from the "C" folder on your emergency-disk section on your OS3.9 cd to your "C" folder on your Workbench partition and try again
