Hi Avis, welcome to the Community!
You'll want to remove the following paths to remove Sourcetree:
User data:
~/Library/Application Support/SourceTree
~/Library/Preferences/com.torusknot.SourceTree*
Application:
/Applications/Sourcetree.app
I'd recommend doing this from the Terminal as Finder doesn't show you the Library folder in your home directory by default. After removing those directories, you should be able to proceed with a clean Sourcetree install from https://www.sourcetreeapp.com/
Cheers,
Daniel
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