Very underrated, best and most useful one I found, been using it since I started playing

You need a program called GCFScape to access the models and textures of Insurgency (this program will also allow you to access the sounds too). Then you need the VTF plugin for gimp.

this is the video where I learned how to mod: Video

Can u tell me - what programm did u use for it?)

That's one fine red-dot