look for the (X86) in yoour files. Then look to the right near the top of the page and type in dlc in the searh then it should open after about a minute. You should be able to Cherub Rock in the dlc folder if you purchased it.
I have it figured out that IE don't work very well with this program. I can open everything just fine with Google. So to save sometime using this program use Google rather than fighting with IE trying to figuring it out. .