Update NAV - Cumulative Updates

Hello,
I have a question on CU of NAV.
I am working on a NAV 2016 CU 1 and there is almost no modifications. (only new objects).

Now I want to update the Customer to the latest CU.

How to I proceed?

1. Update the exsting NAV to the latest?
2. Install a new NAV with the installer of the latest CU, and then import the new objects afterwords?

Thanks in advance.