Version of GTA V

Can i use another version of GTA V for Fivem Or Do I Absolutely Need Rockstar or Steam Version?

must be a legit version no cracks or pirats here

Yes but can it be a free version that has no cracks?

There is no “free” verison of GTA V. You can only have legit copys through Steam or Rockstar.
If you somehow found a “free” verison then it is cracked and that is not allowed on FiveM.

Exactly, my friend is concerned about GTA he wants to start on Fivem, Thanks for the help.