Hi Gabriela, offline installation for SourceTree it's not available. Every user will need to register the product using an Atlassian account, once that step is completed, they'll be able to use the product without an internet connection.
We are tracking feedback on this specific request at SRCTREE-3593. You can add your comment there if you'd be interested to see this feature implemented in the future.
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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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