I am just trying to install sourcetree. When I click on this

A empty window if I use google Chrome and nothing happens. If I use IExplorer and I log in, it says "waiting to log in" for hours. Furthermore, if I try to re-click again on the same icon ( see above) nothing happens anymore. It's like dead. I need to re-click 15-20 times for it to open an (empy) window again.