I believe the 1.9 installer will replace 1.7, no need to uninstall.
Configurations should be preserved.
NO impact on repositories.
The will probably be a slight hitch with the license. In 1.8, Atlassian changed how licenses work. During/after installation of 1.9, you'll need to log in with an Atlassian ID in order for the software to register. I don't know if there is a reliable solution yet for users trying to install SourceTree in isolated (no internet) environments.
Supported Platforms macOS Sourcetree has a lot to offer and, like many developer tools, finding and using it all can be a challenge, especially for a new user. Everyone might not love ...
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