I had the same problem few days ago. These steps worked for me -
Go to C:\Users\<Username>\AppData\Local
Delete the Atlassian folder (CAUTION - This will delete all history and past logs. Do not do this if you need your data)
Re-install Source Tree
Hopefully, that works. If you need your data and cannot delete the app's history. In the same directory as C:\Users\Yash\AppData\Local\Atlassian . Open the second folder with the name "SourceTree.exe_Url_********" or something similar and delete the previous versions of source tree.
I just installed SourceTree 3.1.2 (upgrading from 1.5.2), and apparently something went wrong. It didn't start, and neither did the installer. Removing the directory and running the installer again did the trick!
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