Do I need to run the UpdatePortsNoUNCodes script found in Distances releases?

On-Premise clients looking to upgrade their Distances table to the latest release may see the following instructions in the Client Center:

”UpdatePortsNoUNCodes only if you don’t want any changes done to the UN Codes. Otherwise use tzoneupdate and updateportsV7”

The "updatePortsNoUNCodes" script in the distances file is the exact same script as "updatePortsV7", but it will not update the UN codes of the ports. Some clients add their own UN codes in their ports list and they would like, when they upgrade distances, the UN codes to remain unchanged. 

You can ignore this script if you are not a client that adds or uses their own UN Codes.