Answer:

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

Step 2: Run setup file; here's what you should see:

If you see either of these dialog boxes instead, it means you already have a copy of Foxhound 4 installed: In the first case, you can run the Foxhound "unsetup" process before doing Step 2 again (run the Installshield setup file). In the second case, neither Modify nor Repair will work (they won't hurt, but they won't help either)... however, you can use Remove and then do Step 2 again (run the Installshield setup file). The unsetup and Remove processes will not delete your existing Foxhound database. See also... Another version of this product is already installed. Why is it called "unsetup" instead of "uninstall"?

Step 3: Let the InstallShield process do it's thing:

Step 4: In the case of a fresh installation the "post-setup" process runs automatically:

Step 5: When the setup is finished, press OK to start the Foxhound:

Step 6: The Foxhound Activation page will appear in the browser window:

See also...
How do I get a copy of 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?