How does it not work?
Can't it be loaded or pasted by World Edit and if yes, what's the error message?
Or are blocks missing or wrong when you paste it?
Tell me exactly what "doesn't work" mean xD

You need to have the mod World Edit installed if you want to use it in singleplayer or the server you are playing on must have World Edit installed. For installing World Edit you will need Minecraft Forge.

When you have World Edit, there is a folder called "schematics" in the "worldedit" folder in the "config" folder in the ".minecraft" folder which you reach by typing %appdata% into the explorer bar (the thing that shows the location where something is saved) and hitting enter.
You download the schematic from this site and put it into the "schematics" folder mentioned above.
Then you can use the World Edit command //schematic load <schematic's name> ingame in the world where you would like to paste the schematic and paste it with //paste.

When loading the schematic you have to write the schematic's name exactly the way it is displayed in the "schematics" folder, but without ".schemtaic". Since it mostly is a very complicated name after downloading, I would advise you to change the schematic's name prior to loading it ingame.

That all sounds super complicated, but you have to do it a few times and get used to it, then it won't seem this complicated anymore :)
If something still is unclear just ask me again ^^

Thank you :)

That's a nice idea. Unfortunately there is a rule on pmc prohibiting posting already posted submissions. But I would have to do exactly that when composing a map with all my Mad Max vehicles. So, I think I can't do it, but you can ^^