Please see the links below for info regarding how to access the print material folders:
PC: http://windows.microsoft.com/en-au/windows/compress-uncompress-files-zip-files#1TC=windows-7
MAC: https://support.apple.com/guide/mac-help/compress-uncompress-files-folders-mac-mchlp2528/mac
If you are still encountering issues with accessing the zip file folders, please let us know.