I am currently running Datacom 12.0 and wondering if I upgrade directly from Datacom/DB version 12.0 to version 15.0 or 15.1
For Datacom/DB you cannot upgrade directly from version 12.0 to 15.0 or 15.1.
The Datacom/DB 15.0/15.1 upgrade process can only upgrade a 14.0 Datacom/DB MUF.
You will need to first upgrade from version 12.0 to 14.0 and then upgrade from version 14.0 to either 15.0 or 15.1.
The upgrade to 15.0/15.1 has been simplified and is now called an Perform an Active MUF Upgrade
** Please refer to KB Article #39440