Try this version 2 first. Unzip/unrar it anywhere. Then double click to launch it. To activate the script in-game, press F4. To stop the script, press F4 again.

Use this version 3, instead of version 2, if your game has trouble registering the key presses from the script.
Unzip/unrar it anywhere. Then double click to launch it. To activate the script in-game, press F4. To stop the script, press F4 again.