I've looked everywhere but I can't find a WORKING link to Aru's C++ 0.5.1 SDK. NOT the redistributable, the SDK. Please, if anyone finds it, please give me a link.
I have found something. The C++ Script Hook SKD (Development Kit). I don't think that there's a 0.5.1 version of this but 0.4.0. You can download it here. Hope this helps.