Try using "Script Hook V" not "Script Hook V Dot Net". They both are designed to do the same thing but for different programming languages. Lt. Caine recommends in his ELS post to use the original script hook v, which is located here:
http://www.dev-c.com/gtav/scripthookv/
If you have both, like myself, in your Main GTA folder you'll have files as so;
For Script Hook V
ScriptHookV.dll
dinput8.dll
A trainer comes with, but I don't have that installed.
For Script Hook V Dot Net
ScriptHookVDotNet.asi
If you need more help, or that doesn't work let us know.