Cumulative Updates

Cumulative Update 15 for Microsoft Dynamics NAV 2015 has been released- By Dynamics NAV Team

Cumulative Update 15 includes all application and platform hotfixes and regulatory features that have been released for Microsoft Dynamics NAV 2015.

For more details see below link :
https://blogs.msdn.microsoft.com/nav/2016/01/07/cumulative-update-15-for-microsoft-dynamics-nav-2015-has-been-released/