### SOLVED ####
Turns out that I did have the same issue as 'gclev3' and his steps worked to solve my issue. Here are some extra details.
The SharePortUtility_10_X.pkg are just wrappers for the other packages in dir655_macos_shareport_utility_101/SharePortUtility/SharePortUtility/contained_packages. The package that was actually throwing the error was "Silex_kext.pkg" and if you run that package directly you get a similar error message to the one mentioned in my original post but it says "the following install step failed: run preinstall script for Silex Kext Installer".
Running the Silex_kext.pkg that is part of the Belkin install that gclev3 linked to worked and after a reboot (and a message from OS X stating that it was doing something with some cache files needed for boot... which was a little scary) SharePort Utility worked first try! Previous to getting the Silex Kext installed SharePort would fail to connect every device I tried to connect including a USB drive, iPod Shuffle, and an HP All-In-One (MFP). It would see the devices but would give some kind of connection failed message. Now it all works great!
Ps, another indicator that there was a problem with Silex Kext was that the 'About' screen for SharePort showed "SXUPTP Driver : x.x.x" but now it shows "SXUPTP Driver : 1.3.0"