is it possible to change the http port from 5000 to 80 after installation?
I've upgraded to V15 and obvious I've selected 5000. Https is correct set to 443.
If not, what would be the best way to correct this?
I am afraid that your best option is to perform a full backup, un-install (restart your machine)and re-install by restoring your backup and selecting the ports you want when prompted in the installer.