SourceTree on Mac does not have a clone button in the toolbar (it does in the Windows Version), so how do you clone a git repository on mac? In any open Window go to
Goto File > New / clone
You will see four options. Select the first “Clone from URL”. The above dialog box will appear. In source URL, you will have to copy the source destination (no browse button available). In destination, click the browse button and navigate to where you want to create clone (you might have to create new directory). Give it a name and you should be all set.
This apparently is too complicated than it should be.