Cumulative Update 27 includes all application and platform hotfixes and regulatory features that have been released for Microsoft Dynamics NAV 2015.
The cumulative update includes hotfixes that apply to all countries and hotfixes specific to the following local versions:
1. Test the cumulative update in a non-production environment.
2. Make a backup of the system or computer where the cumulative update is to be installed.
3. Note: Microsoft Support Website.