Don’t ignore the second half of the template. They are the most important questions you should answer!
CitizenFX.log file
.dmp files/report IDs
If an issue with starting:
GTA V folder screenshot
GTA V/update/x64/dlcpacks screenshot
Filepath to FiveM folder
FiveM client folder screenshot
Did you try to disable/uninstall your Anti-virus?
Also add what you already tried so far.
Please also describe the issue you are having, providing as much information as possible will help us to help you. A good format you could use: what have you tried to do, what did you expect to happen and what actually happened.