As I said, I was annoying, I waste many hours to fix it. I install sourcetree 2.3.1 on Windows 10. When I come License Agreement, I choose "Use existing account", but it just show a blank page. I tried many way to fix it along articles I found on Google, but no works. Ahhhhh! Why Setting up source tree is so hard, and why Atlassian still using Internet Explorer to connect to your account. Uhhhh, It too hard to understand. My god!