Auto-Tune EFX 3 is compatible with Ableton Live 9 on both Windows and Mac.

Auto-Tune Pro and Auto-Tune Live are compatible with Ableton Live on Mac but not on Windows.

If you're using Ableton Live on Mac, please install the AU format of Auto-Tune EFX 3 and Auto-Tune Live, not the VST format.

Please also see the instructions for scanning plug-ins here (Mac) and here (Windows).

For your general reference, you can always find the latest Antares plugin compatibility information on the Host (DAW) Compatibility page, and operating system compatibility page.