Software companies in general just don't see the need for building in support for old, out of date and likely insecure operating systems.
If you really need Sourcetree to work on that Mac, perhaps consider upgrading it to a newer version of the OS using something like MacOS patcher.
Failing that, an old version of Sourcetree should connect to any remote git repository. If you can clone the repo using the command line, then Sourcetree should be able to support whatever was produced. In general, I always clone on the command line and then afterwards, run this in the root of the repo:
stree .
...then Sourcetree opens up and you can continue.
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