Workgroup Server 9150/120: Drive Setup Compatibility

I have a Workgroup Server 9150/120. The version of Drive Setup (1.2.2) that comes with System 7.6 gives an error message "Cannot be used with this Macintosh" when trying to launch the Drive Setup.

I used version 1.0.5 of Drive Setup and everything worked fine. What is happening?
Drive Setup 1.3 or later is recommended for Power Macintosh Workgroup Server 9150 running on 7.6.

This article can help you locate the software update mentioned in this article:
Published Date: Feb 18, 2012