If you are unable to uninstall ActivDriver using the uninstaller application, disconnect all Promethean devices from your Mac and follow the instructions below.

Click the ActivManager icon and select Quit.
User-added image

Click Yes.
User-added image

Go to: 
Applications | Promethean and delete the ActivDriver folder
usr | local | share and delete the promethean folder
Library | LaunchAgents and delete com.promethean.activhardwareservice.plist
Library
 | LaunchAgents and delete com.promethean.activmgr.plist
usr 
| local | lib and delete libactivboardex.dylib
usr 
| local | lib and delete libactivlog.dylib
etc 
and delete Promethean-activdriver.ini
Documents
| Promethean and delete the Atlas folder


Restart your Mac to clear the cache and remove the ActivDriver and its components. Next time you log in, ActivDriver should no longer be installed.