Asi Loader is essential because it allows you to launch. Do the same with both dsound.dll (this is the Asi Loader) and NativeTrainer.asi.If it does, we'll update this guide, but you're stuck with vanilla GTA 5 until then. Unfortunately, Script Hook V hasn't been updated to support the Epic Games version. If you're playing the game through Steam, this can be found in \SteamApps\common\Grand Theft Auto V\.
