I was helped by Apple Enterprise Support:
Delete the Server App, Empty Trash and Re Download Server App
You are going to do that EACH TIME you delete one of the Service Folders:
If you are stuck on Calendars and Contacts...go to:
- HD/Library/Server/Calendar and Contacts and delete THAT FOLDER.
- Delete Server and Re Download Server App.
- Open Server
If it stalls on another service..Go to:
- HD/Library/Server/"SERVICE YOU ARE STUCK ON" and delete THAT SERVICE FOLDER.
- Delete Server AGAIN.... and Re Download Server App.
- Open Server
DO NOT DELETE "PostgreSQL" folder or other folders which you are not familiar with!!!!! - Only the Service related folders.
It took me 3 rounds of this till it completed the Server Setup!!
There COULD be a sudo command to restore factory settings but Enterprise did not recommend this as it may have only applied to the OLDER server apps/OS and might completely break your current server settings.