http://support.apple.com/kb/TA46441?viewlocale=en_US

It says it was on the appleshare admin disk.

I want to say it is in this .sit which you could get from apple's servers except they are flakey these days http://files.oldos.org/files/macdl/AppleshareFileServer2.sit

Note that you might prefer AppleShare 3+ ... since that works better with OS X but maybe that doesn't have anything to do with the desktop manager!