The Apple logo should appear on your screen with a loading bar, and after that you should boot into Safe Mode.
From here, run the mac OS update as you normally would to install the update – hopefully without a hitch.
If you're using an older version of OS X, updates are handled through the Software Update utility.
Also note carefully that 2.3.1 Audacity on Mac is now a 64-bit application.
This means that if you are a user of previous Audacity versions on Mac and had installed the optional LAME and FFmpeg libraries then you must now install the 64-bit versions of those libraries.
Because of software patents, Audacity cannot include LAME or FFmpeg encoding software or distribute such software from its own websites.
Instead, use the instructions below to download and install the free and recommended third-party libraries for LAME and FFmpeg.
As always, before performing a system update of any kind, make sure you have all of your sensitive data backed up.
If you’re here because your Mac is already frozen – which I’m willing to bet most of you are – still, don’t worry. Just make backing up your data a priority in the future. If it’s clear that your Mac update isn’t going anywhere, then hold down the power button to turn off your Mac.
Also, don’t update mac OS if your hard drive is running out of space. Once you’ve done this, boot your Mac into Safe Mode.
There are several ways to do this, but the simplest is by holding the key as it’s booting.
Installing the 64-bit libraries will not overwrite or delete your 32-bit libraries. Audacity runs best with at least 1 GB RAM and a 1 GHz processor (2 GB RAM/2 GHz on OS X 10.7 and later).