I believe they have recently released 5.2.51 or something like that (am not sure about the last number ... it is 5x). This new version is OA only (I am not 100% sure) so you need an OA PDK to make it work (unless you are planning ot create a PDK of your own).
Cadence has updated their license features. If you get the latest license from cadence, you should update your IC to IC USR4 or later ISR.
After our IT installed USR3 and renewed the license, we can not use the tools which our license should support.
Cadence field application engineer came to our office and found that the latest license does not support USR3.