Maybe I'm missing something but I don't see anything else that you have to download.
"Simple Root is now one click! You can now root your HTC EVO with one click. This is still for the 1.47.651.1 OTA update. Just download the file, install and click the shortcut on your desktop! Download below!"
Also that video doesn't really show much. It's too zoomed out to really see what he's doing. There's no directions on what to do. I hit step one then step two hit RA_Recovery. What do I do after that? I'm assuming rebooting the phone, but what am I doing in the optionis when the screen comes up with the androids on the skateboards?

God I'm such a pathetic noob. I went through the downgrading process with no problems but I can't do a simple "2 step" way to root.. smfh..