Answer
Make sure the client computer has Microsoft .Net 1.1 installed. If necessary, you can get it from the Windows update page.
Run the attached AltirisDiagnostics.msi, which will install the new logviewer as well as the profiler (the full diagnostics tools). This will allow you to be able to view or import log files or log directories. You can also use the profiler to open and view profiler files from past profiler runs.
When the installation is completed, the logviewer.exe file is located (by default) at C:\Program Files\Altiris\Diagnostics. You can create a shortcut for and place it on your desktop for easy access.