Recently, a new Immortality mod menu was developed with an infinite orbital cannon, but now a new version of Immortality v0.5 Made by HeRo is available.
Grand Theft Auto 5 (GTA V): Cheat (Immortality v0.5) [1.42] Free Download
Checked on Steam version. The archive contains HeRo’s.dll which needs to be injected into Extreme Injector v3.7.3. You don’t need to copy anything to the game folder, unpack it to a convenient place. F4 activation. Management – scroll down / up Num 2/8. Selection of functions Num5 / Enter. Return / Close Menu Num 0 / Backspace.