I can't intall sourcetree 4.0.1 in my mac with macOS Catalina version 10.15.6
I'm afraid "I can't install" tells us nothing. You will need to explain where you are stuck and what is going wrong.
I have the same issue with the same macOS version. The popup with message: "This software needs to be updated. Contact the developer for more information." was presented when I try to install the latest version of SourceTree.
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