Dxn'snitrogen.exe
There is no such thing as a working "Nitro Generator." If a file promises free paid services by simply running an executable, it is almost certainly a trap.
If you have downloaded it but haven't opened it, delete it immediately and empty your trash. If You Already Ran It: DXN'sNitroGen.exe
Instead of giving you free Nitro, the program searches your computer for your Discord login "token." Once it has this, the creator of the file can log into your account without needing your password or 2FA. There is no such thing as a working "Nitro Generator