Here is the email I received from élo support:
You should uninstall the existing touch driver, and install the latest Mac driver:
Version 5.0.2 download: https://drive.google.com/file/d/0B5T-T3Yb4VD6dkx2ZE1xeFRLLTg/edit?usp=sharing
(Includes gesture app by default.)
Controllers:
Elo, 2521 iTouch Plus, USB
Elo, 2515 EloSawJr IntelliTouch Plus, USB
Elo, 251x IntelliTouch Plus, Serial
Elo, 251x IntelliTouch Plus, USB
Elo 2216 AccuTouch, USB
Elo 2500U IntelliTouch, USB
Elo 2700 IntelliTouch, USB
Elo 3000U AccuTouch, USB
Elo 4000U CarrollTouch, USB
Elo 4500U CarrollTouch, USB
Elo 5010 Surface Capacitive, USB
Elo 5020 Surface Capacitive, USB
Elo 7010 APR, USB
Elo, Smartset, Serial
Elo, Optical, USB
Elo, PCap Touchscreen, USB
Documentation: http://touch-base.com/documentation/MacOSXPlatformNotesV5.htm
Gesture documentation: http://touch-base.com/documentation/Gestures.htm#_Mac_OS_X
Gesture update history (for release 2.0.21): http://touch-base.com/documentation/DevelopmentHistory.htm#MacOSXGestures