/etc/perms/rts should contain a line that reads:
where ... is the current release number of your OS. If it
is not correct, BackupEDGE will not install. If
you are unsure about the appropriate value, check the file
/etc/perms/rts from the original SCO installation media. It will
have the correct value.
For example, some versions of OS5 have a line that should read
Sometimes it is changed to
to trick software that was not meant to run under OS5 into installing.
It may never have been changed back.