Macs contain a security application called ``Gatekeeper'' that can cause problems when installing the OT, especially on machines running Mac OS versions more recent than and including Catalina. Here we include some information that might prove helpful, when working with both the installer and the tarball.
For example, starting the OT Installer will probably bring up a dialogue box saying that the application cannot be opened due to it or Java being from an unidentified developer. In order to overcome this one must open the ``Security & Privacy'' section of ``System Preferences'' and enable the installer there (``Allow Anyway''). This might need to be done even if the dialogue box does not mention the reason for the failure to run the installer. It is also probably necessary that the settings allow applications to run from ``identified developers''. More information can be found at the following url: