I tried installing the R12 version (from MG) but ran into a roadblock: the Installer said: This is not the correct Install disk. Make sure you are using the original installer disks ..." and then it quit.
I got to this point with the following steps:
1) Downloaded archive from MG
2) expanded archive with Stuffit Expander v7.0.3
3) mounted all disk images concurrently with Stuffit Expander v7.0.3
4) Ran the installer in the "Install" disk
5) Selected the destination disk
6) Got the message above.