Uninstalling Pitch n' Time Pro or LE can be a bit confusing as they don't appear as an application or installed program.
Please refer to the locations and steps below for the relevant operating system.

• Mac OS X;

Pitch 'n Time Pro 3 and LE 3 are installed OS X via the following location;

Mac HD/Library/Application Support/Avid/Audio/Plug-Ins

Ensure your DAW and the plug-in are not open, and navigate to this directory, where you'll notice either the Pitch n Time LE.aaxplugin, or Pitch n Time Pro.aaxplugin - you can simply move these to the trash.

• Windows;

Pitch 'n Time Pro 3 and LE 3 are installed on Windows via the following location;

C:/Program Files/Common Files/Avid/Audio/Plug-Ins

Ensure your DAW and the plug-in are not open, and navigate to this directory, where you'll notice either the Pitch n Time LE.aaxplugin folder, or the Pitch n Time Pro.aaxplugin folder - you can simply move these to the recycle bin.