To uninstall:

On Windows 7, go to: Start -> All Programs -> GenArts SapphireAVX.  Select "Uninstall SapphireAVX".
On Windows 8, search for GenArts Sapphire AVX.  Select "Uninstall SapphireAVX".
On Mac, go to: /Applications/GenArtsSapphireAVX folder and double click on "Uninstall Sapphire".

• A deactivation dialog box will pop up.
• Choose to "Deactivate"

Internet connection is required in order to successfully deactivate your license.