The video tutorial?
Lemme guess -- you downloaded the MD5 Checksum? That's not the tutorial itself -- hell you don't really even need it. (Its a file used to verify files transferred over the internet... sort of like a UPC code on a carton of milk or keyboard. It identifies a file as a file... its not the file itself.)
When you get to that screen -- click the link in cyan (I blurred out the filename because it will be different depending on which tutorial you download) and you will get the file... you most likely clicked the link BELOW -- which is NOT the tutorial.