how the heck do I download the new firmware for the wifi shield off of github?

ok, i went to github to get the new firmware for my wifi shield. However, when I got to github, I did not know which file was the actual firmware, so I looked at all of them. Also, I could not find anny of them that would obviously download. I am not familiar at all with github. Could I get a little more guidance, please?
:disappointed_relieved: