How to Fix 'The installation failed" error on Mac?

Are you seeing “The installation failed” error when trying to install a Mac app using a .pkg, .dmg, .zip, or other types of downloaded files? This tutorial goes over all the solutions to fix this problem.

One of the most frequent issues you may encounter when installing a new app on your Mac is being prompted with the following error message: “The installation failed. The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.”