Answer:

Step 1: Download the Foxhound Installshield setup file from the Foxhound home page.

Step 2: Run Installshield setup file; it should display this dialog box when it starts up:

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If you see this error message instead, you already have a copy of Foxhound installed and you have to run the Foxhound "unsetup" process before doing Step 2:

The unsetup process will not delete your Foxhound database. For more information see:

Another version of this product is already installed.

Why is it called "unsetup" instead of "uninstall"? and

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Step 3: When the Installshield setup portion of the Foxhound installation is complete, this dialog box will appear; click on the Post-Setup button to continue the installation.

This part is critical; if you don't let the post-setup process run, Foxhound won't be fully installed:

Step 4: When the post-setup process finishes, press Enter to start the Foxhound engine:

See also...
How do I get a copy of Foxhound?
What is Foxhound?
What are the Foxhound system requirements?
How do I install a new version of Foxhound?
How do I reinstall 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?