Symantec Endpoint Protection managed client trial license key issue

I am deploying SEP14 with trial key while waiting for our actual key to arrive. I was told by our supplier the trial key cannot be replaced with actual key. We have to unstall the SEP manager and export the manage client exe file again. All managed client have to be uninstalled and resinstall with the new managed client exported exe file. The trial key software that i downloaded from Symantec website can only be activated with actual license within US only. I have 130 user in HQ office and 60 user in branch office. So is this true. Appreciate any advice. Thanks.