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According to wikipedia, there was no "5.2", what is that supposed to be?
How to make the 5.1B iso bootable on a DEC Multia (UDB) system ?
Is there any chance you could upload the OS for Tru64 UNIX 4.0F version? I have a very big hardware dependency on that particular version.
Furthermore, I would have tried to install the 5.0 version, but the iso must be corrupted (unsupported format, can't mount). While the iso file of 5.1B version is not bootable and has no info how to install the OS using the files contained in the /ALPHA/BASE directory.