There's all these different versions offered at different web pages. This is confusing. If the software is no longer supported by the company, please remove it from those websites. Please make a clear statement that you're not supporting it anymore. Right now there's also an unsigned version floating around that MacOS cannot verify.

1. On the support page for Sourcetree, there's a link to "Download the latest version for MacOS" which links to version 2.5_c
2. On the product page for Sourcetree (https://www.atlassian.com/software/sourcetree) , the download link links to version 3.1.2_216
3. On the App website (https://www.sourcetreeapp.com) the download links to version 4.0.2_236 and this one is unsigned.