No, if you need to download the AC you can't play atm. Jim didn't finished the FaceIT / EAC protection yet. It will be released soon, stay tuned.
And no, if you buy the hack right now you don't have instant acess. You need to wait 24-48 hours to have acess. Since you are from Argentina and i believe you will face the same rules brazilians do, you will need to send him a copy of your ID (scanned or photo) because the high amount of frauds from our country. After this you need to wait for activation.