stable version of controller unifi

Hi guys.I am very happy to join you...

I want to use radius and hotspot service of unifi controller.

now when i enable hotspot service,it doesn't redirect web auth for authenticate Voucher based.

version controller:6.0.40

firmware access point:4.3.20.11298 AP AC LR

I just want to ask from someone who use unifi controller and radius and hotspot, which version of controller and firmware access point they use ?

Thank you.