Apple - How to allow install of non app store or identified developers on MacOS Sierra
From: How to Allow Apps from Anywhere in macOS Sierra Gatekeeper
Quit out of System Preferences
Open the Terminal app from the /Applications/Utilities/ folder and then enter the following command syntax:
sudo spctl --master-disableHit return and authenticate with an admin password
Relaunch System Preferences and go to “Security & Privacy” and the “General” tab
You will now see the “Anywhere” option under ‘Allow apps downloaded from:’ Gatekeeper options
Just right-click (or ^ ctrl click) the pkg file in question and choose Open. This will let you open the file no matter where it came from. Note that this is different from double-clicking.
You can do this with any application downloaded from the Internet, and macOS will remember that application next time you run it.
From a security standpoint, I prefer doing this over disabling the safeguard systemwide.
To do this without needing admin privileges and without disabling security features:
- Open up terminal
- Type
xattr -c - Drag (from finder) the file you wish to open into the terminal window
- Run the command by pressing Enter
xattr -c removes the metadata of a file or folder. This removes the developer, date of download and a few other things. It does not effect the contents of the app.