Advanced Mac users may wish to allow a third option, which is the ability to open and allow apps downloaded from anywhere in macOS Sierra. You’ll now be able to open and launch apps from. You can enable 'Subtitles/CC' in this video Running into issues installing downloaded apps on your Mac in Sierra or High Sierra or Mojave? Is your Mac tell.
macOS High Sierra is a great update and brings lots of new and much needed improvements but that doesn’t mean that some of the changes can’t be annoying.
For example, just like in macOS Sierra, one of the changes that Gatekeeper comes with is that there’s no immediate way to allow unsigned apps to open.
Up until now, Gatekeeper also allowed you to open apps downloaded from “Anywhere” but that’s no longer the case. Of course you can still open unsigned apps, but it’s a pain in the ass.
Let’s say you want to open a free app like Audacity. Open it and you will get this pop-up…
Ok, nothing new here. This was present in previous OS X version too. However, in previous versions you always had the option to set OS X and allow unsigned apps from “Anywhere”.
In macOS High Sierra that option is missing and, you will always have to go to System Preferences>Security & Privacy> and click on a new button that says “Open Anyway”.
Luckily there’s an easy fix for this:
1. Open up Terminal, type “sudo spctl –master-disable”( no quotes ), and hit enter ( NOTE: you might not be able to copy – paste the command in the terminal. See the screenshot below to make sure you enter it correctly )
2. Type in your password ( you won’t be able to see what you’re typing ), and hit enter
3. You’re done.
Mac Allow Apps Downloaded From Anywhere Missing
Now you can go to Preferences>Security & Privacy and choose “Anywhere”
Mac Allow Apps Downloaded From Anywhere Not Showing
NOTE: if you want, for some reason, to go back to the way macOS High Sierra wants it all you have to do is repeat all the steps above but instead of “disable” change it to “enable”. ( i.e. “sudo spctl –master-enable” )