I wouldn't be able to answer that without details. Won't let me launch is too vague for me to diagnose the issue. I would need to know what you're doing to launch the game and what specifically is happening.
So the problem is I downloaded it not with the pack and everytime I install it nothing happens. My dad tried helping me trying to extract it with 7zip and what not. It just won't work. It refuses to Launch everytime I download it, like I said everytime I install it. Nothing will happen. Please HELP.
Here is a guide for how to send emails: https://www.wikihow.com/Send-Someone-an-Email
You'll have to replace the [at] with an @ symbol.