Server Administration tools 10.4.11 not installing properly on 10.4.11

I have a 10.4.11 PPC OS X Server on an XServe, as reported by About this Mac, but the Server Admin tools are not at that version level. I want to upgrade them to the latest version. The Server Admin is at 10.4.7 and the Workgroup Manager is at 10.4.4. I downloaded the 10.4.11 toolset from Apple and attempted an upgrade, but there was no change in the tools' version numbers! I installed them on a different "clean" 10.4.11 and the toolset installed perfectly.

Thinking there was an object conflict, I copied /Applications/Server to /Applications/ServerOriginal and cleaned out the original /Server folder, then reran the installation. Still no change!

Is there some kind of configuration file, plist, or something that's preventing the update? Any ideas appreciated. Thanks.