This document describes how to enable installation of applications from sources other than the Mac App Store on macOS.
Topics Map > OS and Desktop Applications > Operating Systems > Mac OS X
Background:
Aug 05, 2012 Apple Footer. This site contains user submitted content, comments and opinions and is for informational purposes only. Apple may provide or recommend responses as a possible solution based on the information provided; every potential issue may involve several factors not detailed in the conversations captured in an electronic forum and Apple can therefore provide no guarantee as to the. Apr 11, 2019 Select ”Allow booting from external media.” Your Mac doesn't support booting from network volumes, whether or not you allow booting from external media. If you want to select an external startup disk before restarting your Mac, quit Startup Security Utility, then choose Apple menu Startup Disk.
By default, Mac OS only allows users to install applications from 'verified sources.' In effect, this means that users are unable to install most applications downloaded from the internet or stored on physical media without receiving the error message below:
Users can follow the directions below to prevent this error message from appearing in one of two ways:
For more information about this message, please visit Apple's KB article on the topic: http://support.apple.com/kb/HT5290.
Change Gatekeeper Settings (10.8.x / 10.9.x / 10.10.x / 10.11.x):
To Manually Launch Application:![]()
Mac System Software DownloadChange Gatekeeper Settings (10.12.x / 10.13.x):Mac Cannot Allow System Software Update
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