
On this menu select -> Show Library Folder From the top toolbar select View -> Show View Options.Go to your Home folder (usually named after you).To show the Library folder in Mavericks and above do this: Some options are much easier than others. There are 3 ways you can show your library folder. To show your Library folder, it's much easier than in previous versions of macOS. This is because it is hidden by default for security reasons. In some instances, you won't be able to find your library folder on your Mac. Go to: Finder > Go Menu > Hold “⌥” > Library > Audio > Plugins > Components.Go to: Finder\Macintosh HD\Library\ Audio\ Plugins\ Components.

There are 2 ways to find your components folder on Mac: This makes sense as AU plugins are formally named – AU Components. This is where your Mac will store all of the AU plugins.
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To install your plugins in Garageband, you must find the Components folder on your computer. This may limit the number of free plugins you can use in Garageband. Also, if you are on Garageband 10 and above, you can't use 32-bit plugins. Only AU plugins are compatible with Garageband.

For this to work, you must ensure that the plugin you download is an AU component. You can either purchase VST plugins, or you can download some great free plugins. To use a 3rd party plugin in Garageband, first, you must download a plugin. Enable audio units checkbox in GarageBand > Preferences > Audio/MIDI.Drag your downloaded AU unit to the Components folder.Go to Finder\Macintosh HD\Library\ Audio\ Plugins\ Components.Here's how you can install plugins in Garageband:
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How To Install Plugins in Garageband (TL DR)

Why Aren't My Plugins Showing in Garageband?.Permanently Fix “Cannot be open because developer cannot be verified” – Garageband.Fix “Cannot be opened because the developer cannot be verified” – Garageband.How To Open Audio Unit Instrument Plugins.Enable audio units checkbox in Garageband Drag your AU plugin to the “Components” folder How To Install Plugins in Garageband (TL DR).
