Issue: when running Liquid Mix's installer I receive 'The installation failed' message.

Solution:

Download Liquid Mix's latest version 3.0.
Connect Liquid Mix to your machine.
Open the dmg file, select the mpkg file, right-click and choose 'Show Package Contents'.
Go to Contents --> Packages and run the LiquidMixManager installer and the relevant plugin format installers.

Go to your 'Applications' folder, right-click Liquid Mix, click 'Get info' and tick the 'Prevent App Nap' option.
Download the Liquid Mix Emulations file from here.
Open the dmg file, select the mpkg file, right-click and choose 'Show Package Contents'
Go to Contents --> Resources, right-click the 'Emulations Files' file and 'Show Package Content'
Extract the 'Emulations Files.pax.gz' file.
Copy the generated LiquidMix library and paste it in "/Library/Application Support/

Launch 32 Lives.
Select all Liquid Mix instances and click 'Resurrect' (if you resurrected the AU version, 32 Lives will ask you to restart your machine).
Launch the Liquid Mix app, launch your DAW, and Liquid Mix should be available.