Script Hook V has a descriptive name: it's a library of files created by Alexander Blade that allow enterprising modders to write scripts that then hook into Grand Theft Auto's singleplayer mode. This is the basic tool that makes modding possible. Download Script Hook V from here.
In Grand Theft Auto V, Script Hook V has been removed from the gamesource, but for now it still exists as a third party. Should an error be discovered in it, you should try to download it directly from the link above.
src-l-jack In case you are the homesick type who wishes to have athe gamescript written for his mod able to hook into the Grand TheftAuto engine. This is the socket the SDK spawns when it tries to make a remote resource to add to the gamescript.
Script Hook V comes with a patch called "LnkPatch" which performs the link functionality. It is a.plk zip file which contains a moddir folder and then a patcher.txt file. To patch the mod directory, you extract and run: "Patch "./mod_".*plk" d2c66b5586