You will need to unzip the file using something like, http://www.7-zip.org/
Then copy the unzipped folder into your Minecraft saves folder:-
http://www.howtogeek.com/207484/how-to-find-your-minecraft-saved-games-folder/?PageSpeed=noscript
You should be good to go then, hope this helps.
I downloaded this, and apologies for my stupidity but I have no idea what to do next, If anybody could help that would be amazing!
You will need to unzip the file using something like, http://www.7-zip.org/
Then copy the unzipped folder into your Minecraft saves folder:-
http://www.howtogeek.com/207484/how-to-find-your-minecraft-saved-games-folder/?PageSpeed=noscript
You should be good to go then, hope this helps.
I forgot to mention, Next just load the game from the load menu in game. :P