Terrain to object?

I found a script that converts a terrain to object when i placed it in the editor folder. I followed all the steps and it did nothing.

http://wiki.unity3d.com/index.php/TerrainObjExporter

It came up with the problem when viewing the script in the inspector: "No MonoBehaviour scripts in the file, or their names do not match the file name."

I need to do this so that I can rotate my terrain.

Help Please.

Also the script looks really old, like from 2010. I'm using Unity 5 and probably a lot of things especially in the scripting has changed.