It looks like the last post on Practice CS was a bit too premature.
We needed to uninstall Practice CS 2009.2.3 from the server, reboot, and reinstall.
We ran into a problem with the mapped drive letter during the install of 2009.2.4. It refused to accept the mapped drive so we needed to use the UNC path \\SBS\Programs\WinCSi before we could get the product installed.
Once we did, we sent out an e-mail to the client update Setup.exe file and all was good to go:
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book