GTA V version is not the latest release. In fact, this version dates back to a specific patch from mid-to-late 2015, shortly after the PC launch. It corresponds to game build 335.2 , which was released around June 2015.
If you are looking for this specific download, you are likely trying to re-enable mods on a game installation that matches this version number. Script Hook V 1.0.335.2 Download
: Press F4 in-game to open the Native Trainer menu. GTA V version is not the latest release
Installing Script Hook V 1.0.335.2 is relatively straightforward: Script Hook V 1.0.335.2 Download