Once purchasing the software, you click download loader - log in through the loader - open steam then csgo - then click "ins" on your keyboard. To answer your question, yes you get it instantly
Zapped has been out to close to a year with no detection, one of the cheats without detection. Personally, I wouldn't use any cheats on my main account but that's your decision. Most people agree, they wouldn't use any cheat on their main. For how the system works i'm not exactly sure but Ineffable knows, unfortunately he is sleeping. Hope I provided enough information.