Answer:

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Note: A successful installation overwrites existing files. It is your responsibility to make a backup of your existing Foxhound installation if you want one. The simplest way to make a complete backup is to stop the Foxhound engine, then make a copy of the entire Foxhound1 folder and subfolders... do this BEFORE installing the new version of Foxhound.

By default, Foxhound is installed in this location on Windows XP:

C:\Documents and Settings\All Users\Application Data\RisingRoad\Foxhound1

and on Vista and Windows 7 it is here:

C:\ProgramData\RisingRoad\Foxhound1

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If you see this dialog box, you can proceed with the reinstallation:

When the InstallShield process reaches the end, click on the Post-Setup button to continue the installation. This part is critical; if you don't let the post-setup process run, the old installation of Foxhound will not be replaced:

This is what the post-setup process looks like. The registration status (Beta, Evaluation, Full) of your current Foxhound database is copied over to the new one, as well as other settings and all the Monitor samples that have been gathered:

If you see this dialog box, you have to run the Foxhound "unsetup" process first and then run the Foxhound InstallShield setup:

For more information about running the Foxhound unsetup process, see Another version of this product is already installed.

If you see this dialog box, click on Remove to run the Foxhound "unsetup" process, and then run the Foxhound InstallShield setup.

Do not click on Modify or Repair; they won't damage anything, but nothing will happen when you click on the Post-Setup button at the end of Modify or Repair process:

See also...
How do I install Foxhound?
How do I install a new version of Foxhound?
Another version of this product is already installed.
Why is it called "unsetup" instead of "uninstall"?
How do I remove Foxhound from my system?
How do I backup my Foxhound database?
How do I backup my Foxhound database on a regular basis?
Foxhound Introduction - Backup and Restore
The $backup_foxhound1.bat file looked for a path specification in the FOXHOUND1 environment variable and it was empty.