I keep getting that message, I have removed ~/Library/Application Support/SourceTree and /Applications/SourceTree.app and reinstralled and still get that message.
What should I do?
This is usually caused by the SourceTree.app being modified. I've just tested this myself direct from the App Store and it worked fine. Do note that we no longer publish updates to the App Store (this happened very recently) due to sandbox restrictions so it's better to get it direct from sourcetreeapp.com. Perhaps try the direct download first, and if that doesn't work if you could answer the following:
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