Sometimes larger files can become damaged during download, resulting in the failure to extract .zip/.rar files etc. In this event, you may still be able to access the contents of the file using a free and trusted program called 7-Zip.
Download 7-Zip for Free
7-Zip works with any platform, just make sure to scroll through the list of downloads to find the one that works with your operating system.
If for some reason this does not work, you may need to download the product(s) again.