contact decrypt deliver determine document downloaded error file files greatly help manual merchant message open opening ordered problem service viewer

I ordered a service manual from e-junkie and it seems to have downloaded fine but when I go to open the file I get the error message below. Can anyone help me determine my problem? Any help would be greatly appreciated.

"There was an error opening this document. This viewer can not decrypt this document."

You will need to contact the merchant as we deliver the files "as it is".