Node bounties are only paid for the latest version.
As usual you have a 7 day time window to upgrade to the latest version.
The time windows is triggered by an alias "nrsversion" update, which is also used to announce new nrs version witihin the hz client.
The last 'nrsversion' alias update was on '12/13/2015 23:00:26 UTC'
Transaction id is 13358822116601159558 and block id is 6751858650703315890.