
You'll have to go to Logitech's Support pages, identify your product and look for available downloads on a model-by-model specific basis. NOTE: Logitech has removed it's Webcam Settings app from the Apple App Store. That said, it costs nothing to download the Mac Logitech Camera Settings or it's new live streaming Capture webcam software app, install it, plug in your Logitech camera and give it a try to see if your particular Mac and camera model works with it. Some may quit or pop up an incompatibility alert if the proper hardware is not detected.

Developers are able to code their apps to poll for the presence of specific USB devices by VENDOR ID: and Product ID: codes as the app launches. Like many apps written by vendors for their own hardware, the Logitech Camera Settings webcam software for Mac is "offically" only for specific HD camera models. This is an expensive piece of hardware (two, if you count my Microsoft keyboard) rendered nigh-on useless by malfunctioning software.Logitech Webcam Control Software For MacOS And occasionally, randomly, the modifier keys on my (otherwise unsupported by a driver) Microsoft keyboard swap their functions (I have them set to the proper Mac keyboard layout of Command on the right, Option on the left, using the OS X Keyboard prefpane), a problem which is often remedied by unplugging not the Microsoft receiver but the Logitech receiver. Doing this also causes my button configuration to be screwed up I have the thumb button on my Performance Mouse MX set up for Mission Control, and it stops working entirely after unplugging and replugging the Unifying Receiver. It works again, for an indeterminate amount of time, and will often fail again, especially if my Mac has just been started up.

Logitech's solution, as per their forums, is to unplug the receiver and plug it back in again. Oddly enough, all the buttons still work though.

Now, since the 10.11.2 update has come out, my mouse will often lose the ability to track, stopping the cursor dead in its tracks. Everything had been working properly using v3.9.3 on El Capitan.
