hello, I'm new too but it was easy following certain steps.
first, you wanna download 7th heaven, it's a mod manager that makes mod installing much easier. I have the 2.0 version. you can find it here
http://7thheaven.rocks/then, after you install it, you should put a path so 7th heaven can find the new threat mod. It's in settings - general settings - catalog subscriptions - click the "+" and paste this path: iros://Url/http$pastebin.com/raw.php?i=vXc4PpBS
and then save.
this should make the new threat mod appear on your mod list. Then you just have to download it double clicking it.
Hope this helps