Hello,
to get MCUXpresso SDK, please use the "Build your SDK" button on the page, or go directly to http://mcuxpresso.nxp.com. Here you can create and download SDK packages using the SDK builder which is the default way how to get MCUXpresso SDKs.
I notified our web team about the empty Download page, sorry for the inconvenience.
Regards,
Lukas