It’s likely you are trying to open a ZIP file directly in Adobe Reader. ZIP files cannot be opened in Adobe Reader – they need to be unzipped first.
To do this you on a PC you will need to have a program like WINZIP or WINRAR to unzip your files. On a Mac you can double click on the ZIP file and it will unzip automatically. Once your file is unzipped, navigate to your unzipped folder and from there you can open the individual template pages in Adobe Reader.
Please see here for more help on how to unzip: www.wikihow.com/Unzip-a-File.