PhysX 3.3 - Where can I download the SDK

I have the source code from github but i’m getting the feeling i shouldnt be using this. There isnt an sdk download in the download center anymore. Where can I download it?

I cannot find the download link either. All the posts about downloading the PhysX sdk point to this page:
But I cannot find the SDK on this page. Can somebody help?

Same thing for the 3.4 here :\