I'm afraid not, the first version of SourceTree required 10.6. I originally started writing it with 10.5 compatibility in mind, but it turned out to be too limiting, and stats I was collecting on OS usage indicated it was a tiny percentage of the user base so I dropped it in favour of better base functionality.
Supported Platforms macOS Windows We recently introduced support for additional hosting services such as GitHub Enterprise, GitLab (Cloud, Community Edition, Enterprise Edition), and...
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