I know some of you have been having problems with errors on files, such as "unknown compression method", etc. This could be caused by trying to open files with an outdated version of Winzip, or some other unzipping program.
If you use windows, please download the latest version of Winzip, version 11.1 here.
And if you use mac, please download the latest version of Stuffit Expander here.
Hope this helps!
And please let me know if you've been having any problems, and tell me the EXACT error you receive when trying to open files. That would help immensely.