While running the installer: SourceTreeSetup-2.3.1.0.exe

I get asked for a login, 

I choose to use an existing account.

I put in my details :

• email,
• then requested passwd (which I have now changed, as I presumed I had the wrong one)

The login screen then animates, as if its doing something. But never does.

I have tried it several times (even left it overnight)

So I am unable to install SourceTree

:o(