Got error trying to install PSE 11 on my new Windows 8 computer. "The file archive part of PSE 11 is missing."

Please help me! I am trying to install PSE 11 on my new Windows 8 computer. I downloaded the 2 files from Adobe: PhotoshopElements_11_LS15 (.7z file) & PhotoshopElements_11_WWEFDJ. The is the full text of the error message "The file archive part of Adobe Photoshop Elements 11 is missing. You need all parts in the same folder in order to extract Adobe Photoshop Elements 11. Please download all parts." A chat support representative told me he could help with just a few easy steps. The first step was to rename the .7z file PhotoshopElements_11_WWEFDJ. I did this then the chat connection was lost. The next chat representative said they could not help me with this problem. I would have to get help in the forums. Please help me!