No, dont open it.
What you want to do, is go to the folder where it was downloaded to(usually downloads), and find it, right click on it and select "copy".
Then navigate to your toribash game files and go to data>mod> and right click there, and paste it.
Open up toribash and go to the mods menu, and find it. If it's not there then make sure you don't have 2 versions of toribash, and are pasting it in the one folder then opening thhe other toribash.