The end of OpenIV

[ReNNie]

They should've kept it on the down low and then drop it like a bomb, couldn't erase then... but nooooooo

[cyberzone2]

You can't convert maps that contains someone else's IP (this includes Rockstar's IP). Its stated on Rockstar support
https://support.rockstargames.com/hc/en-us/articles/115009494848-PC-Single-Player-Mods

You have to make them from scratch to avoid legal issues.