I have a pair of J-4350s running 9.0R1.10 - they've worked very well since installation, so I haven't seen a need to update the firmware.
I now have a requirement to enable J-Flow. I understand it used to be necessary to license this feature, but can't seem to find these available anymore.
There are also suggestions elsewhere on these forums that this is now free.
Are licenses still required? If not, when did this change? Are there requirements to be running a particular release of the software?