The 77GHz radar reference design can be obtained from here: RDK-S32R27: Automotive Radar Reference Design Kit|NXP using the Buy Tab.
In respect with the software, you can get the binaries or source code from NXP's partner Colorado Engineering Inc. They can provide a quote for it. Alternatively you can download the Radar SDK SW from NXP https://community.nxp.com/thread/479090 and build the radar application by yourself.
Hope this helps!