How do I download and open a .zip file?

iPhone/iPad: If you are using an iPhone or iPad, you can download apps to open zip files. Here are a few popular apps to consider: http://www.appsdose.com/2015/04/4-best-archival-zip-unzip-apps-for-iphone-ipad.html

Your computer: I recorded a short video on how to download and unzip files on your computer here:
https://www.youtube.com/watch?v=jHfHtmRzlmc

There are many free unzip software options that you can use.  For example: http://download.cnet.com/7-Zip/3000-2250_4-10045185.html.   Also, some computers come with an unzip capacity where you can just right click the file and choose “extract all” – you might have that as well.  On a Mac you can use Stuffit Expander for large files. You can find it free here: http://www.stuffit.com/mac-expander.html

You can also find video tutorials on how to unzip a file on YouTube according to the type of computer you have: https://www.youtube.com/results?search_query=how+to+unzip+files