We use .zip files to reduce the size of the files. It gives you the fastest download possible.
Opening files (especially those larger than 4GB) is a feature that's proven to be difficult for the built-in apps of both Windows and Mac. To open them, the program opening the archive needs to support Zip64 archives, and not all the apps do.
There's a different app to unzip your large .zip file available for both Windows and Mac.
On Windows we recommend using 7Zip, which is free and you'll find it here. Please make sure you use version 9.20 or newer.
For Mac The Unarchiver works great - make sure you get version 3.10 or newer.
After installing one of these apps, please ensure you open your zip file with this program and not the one already installed on your device.
Download the unzipping program that's suitable for your computer and you should be good.