downloaded your installer for sourcetree and when I try to open it i get an error that says windows cannot open the file. I scoured the internet and cannot fid any answers. I need this program for my current class in school. I opened your website, clicked download for windows. I did not change anything, not the name of the file or nothing. When it was completed I tried to install it and I get that error. When I choose the internet it brings up nothing that helps. When I choose on my computer, again nothing helps. I need this resolved ASAP. Please help me.