V-Ray for 3ds Max is the core development of Chaos Group, which allows users to quickly and easily create realistic images while giving them full control over the 3D production process.

V-Ray 3.0 for 3ds Max is the most complete lighting, shading and rendering toolkit on the market, making speed and simplicity accessible to all artists. The latest version delivers powerful feature set, technical advances and support for open source technologies.

1. All the files are clean, ignore your AV warnings, If you don?t trust this release then don?t use it.
   
2. I think it will work for 3dsmax 2015 too but I?m not going to crack any older versions.
   
3. Forget the previous patch for RT, this one works for ADV and RT together.
   
4. If it can?t write then Run it as an administrator or suspend your AV, etc ?
   

If installing over the previous RT crack. Remove vray and re install
Working fine so far