Artillery shell.... how to install

I downloaded the new Artillery shell for psp but the only b**ch is i dont know where to save it. There is no direction it just says download. I wasnt sure if it was suppose to be saved in MP_ROOT or what. someone want to help me out with this. Thanx
By the way i have 2.6 idk if it works on here or not.

It doesn't.

you need 1.5 to use it sorry

What if you have 1.5, how do you install artiller live Fire?

well it comes wit the foler psp and artirlly put the artirarlly in the root and the pap open it and put those files in the game folder.