Download link is here:

This is a NBT file, inside your minecraft world folder, if there isn’t one already, create a folder called generated, inside this folder create another one called minecraft, inside the minecraft folder make one more folder called structures. Place the NBT file inside the structures folder. Then inside your minecraft world place down a structure block. Set it to load mode and put in the name windburst_tnt_cannon in it. (make sure entities are turned on) Then click the load button twice and it should spawn the cannon.
(Note: for some reason when you first spawn in the cannon it will fire once. But it should be fine)