Download the Terror v 1.3 Mod Menu from the provided link below.
After downloading the mod menu disable your antivirus and windows defender completely.
Now open Terror Installer.exe as administrator and click on install.
Now in Terror Installer.exe explorer window select your GTA V installation folder and click ok.
Close the Terror Installer.exe after it says done installing.
After all installation process complete start GTA V and launch story mode.
In GTA V Story mode try to open the Mod Menu if the menu start then launch an online session.