In order to properly uninstall the demo of Drive Genius 3, you will need to manually uninstall it.
To manually uninstall Drive Genius 3 delete the following files and folders at the end of the paths listed below. Double click on your "Mac HD" drive to start the path.
/Library/Application Support/DriveGenius
(folder)
/Applications/Drive Genius 3.app
(icon)
If you are running OS X Lion, Mountain Lion, or Mavericks the last three files/folders are located in the user's Library
folder which is hidden by the operating system. You can temporarily access this folder by opening a Finder window and pressing Command+Shift+G. This will bring up "Go to the folder", enter ~/Library
and click go.
/Users/Library/Application Support/DriveGenius
(folder) /Users/Library/Preferences/com.prosofteng.DriveGenius2.plist
(file)
/Users/Library/Preferences/com.prosofteng.DGAgent.plist
(file)
Now you will need to restart your computer.
You can contact Drive Genius support at (877)477-6763 [press 2 for support].