Hi,
-proper is only available in the serial version of Turbomole, not in the parallel one. This option skips the SCF procedure and jumps directly to the property section, which itself does not run in parallel at all.
To run Mulliken, please go to the directory where your input is and run:
$TURBODIR/bin/`sysname -s`/ridft -proper
which will run the serial version of ridft in the property mode.
Regards,
Uwe