Probably because SourceTree's default configuration is to use it's own embedded version, which isn't included in the SourceTree installer. You don't get a chance to tell SourceTree to look for and use a pre-installed version until after it's already set up the embedded one.
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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