I'm trying to install Sourcetree on a Windows 7 32 bit machine.
I have tried to register via Bitbucket (no luck). I have tried to register via Atlassian account: Create New Account.
This is the error that I receive:

This is with Google Chrome. It also happens with Firefox. I've been trying to install Sourcetree all day to collaborate with my partner in the UK using Bitbucket.
What is going on? How do I solve this problem?