Related to what Lady Gaia wrote, if you downloaded the .rar files manually, they'll need to be extracted. One tool is The Unarchiver and I believe what 8Dio mentions. If you use their 8Dio Download Manager to download the files, it does the extraction for you. Once extracted there'll be a Documentation directory and a px directory. You can then copy that px directory to the USB stick.
If that doesn't help, there should be some info on the 8Dio support pages on downloading and extracting those .rar files.