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 Foxhound4 folder and subfolders... do this BEFORE installing the new version of Foxhound.

By default, Foxhound is installed in this location on Windows 7:

C:\ProgramData\RisingRoad\Foxhound4

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What you do next depends on which dialog box appears...

If you see a dialog box that looks like either of these, you have to run the Foxhound "unsetup" process first and then run the Foxhound InstallShield setup as described below:

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:

The unsetup process will not delete your Foxhound database; for more information see Another version of this product is already installed.

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

The post-setup process will ask how much data you want to preserve; just press Enter for ALL data:

Post-Setup Process for Foxhound Version 4.0
*** Checking for a post-setup path parameter...
*** A post-setup path parameter was provided...
C:\ProgramData\RisingRoad\Foxhound4\
*******************************************************************
***                   Foxhound 4.0.xxxx
***
*** Here's where Foxhound is being installed:
*** C:\ProgramData\RisingRoad\Foxhound4\
***
*** Starting the Foxhound 4,0.xxxx post-setup process...
*** Creating foxhound4.db.4,0.xxxx.ORIGINAL_COPY...
*** Checking for an existing Foxhound4 installation...
***  ...yes, there is an existing Foxhound4 installation.
*** Checking if the existing data should be upgraded...
***  ...yes, the existing Foxhound4 data should be upgraded.
******************************************************************
*** PLEASE READ THIS, AND CONFIRM OR CHANGE **********************
******************************************************************
***
*** "FOXHOUND4UPGRADE" specifies how much data is to be upgraded.
***
*** If you want to CHANGE the setting, type in a new value...
***    ALL       - upgrade all the data
***    OPTIONS   - no samples, just the Foxhound options
***    yyyymmdd  - options plus samples since yyyymmdd
***    nnn       - options plus last nnn days of samples
***    NOTHING   - don't upgrade any data
*** and press Enter to continue.
***
*** If you LIKE the current setting...
***    FOXHOUND4UPGRADE=ALL which means upgrade all the data
*** just press Enter.
******************************************************************
Current FOXHOUND4UPGRADE=ALL
New     FOXHOUND4UPGRADE=

See also How do the different FOXHOUND4UPGRADE values work?

See also...
How do the different FOXHOUND4UPGRADE values work?
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?
How do the Foxhound backup shortcuts work?
Help - Introduction - Backup
The $backup_foxhound4.bat file looked for a path specification in the FOXHOUND4 environment variable and it was empty.