If you run the dmg that you downloaded then a window should appear so you can drag SourceTree over to your applications folder. That's all there is to it as per other applications you download outside of the App Store.
Hope that helps
Supported Platforms macOS Windows To make using Sourcetree as simple yet powerful as possible we embed (bundle) dependencies such as Git, Git LFS, and Mercurial. We strive to keep these...
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