This is just a result of how the installer was designed.
You will see two entries in Programs and Features for Paratext 8 - Paratext
8 Packages and Paratext 8.0.x (where x is 75 for most people now).
The Uninstall option will only appear when right-clicking the Paratext
8.0.x entry, but both entries will be uninstalled. The Paratext 8 Packages
may still be in the list after the uninstall, but will go away if you
refresh the screen.
John+Wickberg
Paratext Support