Proctortrack is incompatible with Mac OSX versions that are 10.6 or older. Test takers can upgrade to latest Mac OS here for a free upgrade for computers that are fewer than five years old. Apple charges a fee for computers older than five years. We suggest that users upgrade with or without a need to use Proctortrack as the security risk on outdated operating systems is very high.
Here are two articles with information on Mac OSX describing the importance of an upgrade.