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Cannot open Soucetree on Catalina

I downloaded Sourcetree from the website on my MacBook Pro, running Catalina, and when I attempt to launch it I get the error below. Does anyone know how to fix this issue?

“Sourcetree” can’t be opened because Apple cannot check it for malicious software.

This software needs to be updated. Contact the developer for more information.

5 answers

If you go to System Preferences > Security and Privacy > General you can click on allow apps downloaded from. Over the you will see that something is blocked from source tree, if you accept it it will open Sourcetree again

This worked for me. Thanks!

My company policy does not allow me to download from non-app store, non-verified. Am I SOL?

Got it to work using: sudo spctl --master-disable

I have the same problem

Same problem, worked just fine in Mojave.

0 votes
Kelly Woods I'm New Here Monday

Many common apps like Skype, WinZip and Sourcetree have such an issue on macOS Catalina. Usually you can bypass this new macOS gateway by opening the app through System Preferences > Security & Privacy > Check Allow apps downloaded from App Store and identified developers > Click Open Anyway (as mentioned by Anouk Hermsen).


If it still doesn't work, I assume that you are double clicking on the Sourcetree install icon, yes? Don't do that. Instead right mouse click or control click on it. You should get an Open option in context menu > Select Open > Then the next dialog box you see will be similar to the one you report, but it will also have the Open button added. Choose Open and voila.


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