JJSploit launches just for 1 milisecond and then closes, how to fix it?

I am not sure what you mean by JJSploit just launches for 1 milisecond and immediately closes. 

I ain't got much experience but I can give you some tips,

• Have you tried restarting your PC? there could be something that's forcing close JJSploit.
• Re-install JJSploit
• Re-install windows (if the steps above doesn't work)
• Get another executor (if you want a keyless executor just get an executor that uses the WeAreDevs API, such as mine called synthium)

The steps above seem pretty stupid but I don't know.. I don't have much experience, am just saying, these steps could help.

- I hope your issue is solved.

Don't listen to him, there are many other better exploits than "synthium" (no offense) your UI isn't that good and has a crappy code. Use something better, I would recommend Comet, Kiwi, Dansploit, or any of the exploits on the front page.

Don't use any exploits with WRD API they are all detected, and can get your HWID bans

move to a different exploit, preferably a multi api one. boom is right do not use synthesize or whatever it's called 

@B00M, it was just a form of advertisement. I wouldn't really recommend using kiwi x though since it has their own key system besides their main api is WeAreDevs. If your gonna use kiwi x you would have to choose another api like KRNL api and that has a big key system. Comet is good, I can agree with that.