CUDA SDK for Windows download?

Accelerated Computing CUDA CUDA Programming and Performance
1

Hello, I would like to download the SDK so that I can compile some of the examples. I heard that the SDK is not supported by Nvidia. Does this mean we should not use it? Why is that? I think the most recent version of the SDK is 3.1 correct?
Thanks

2

Hello, I would like to download the SDK so that I can compile some of the examples. I heard that the SDK is not supported by Nvidia. Does this mean we should not use it? Why is that? I think the most recent version of the SDK is 3.1 correct?
Thanks