i also use this MW3 Killstreak Editor [Updated]
i run LAunchIW5MP.....change my first 3 classes to supportkillstreaks..then go to tthe main screen(Play,vault,servers,options,quiot)then go back to desktop and start the tool..then wen i open it...in red it says "MW3 multiplayer not found" just like how he showed in the SPoiler screen picture..
i also use this MW3 Killstreak Editor [Updated]..in dis it says wen i select class,packages,then click SAVE...it says"MW3 Pultiplayer was not found"