This article provides a step-by-step instruction on how to upgrade a SQL Server 2012 RTM Evaluation Edition server to a BI edition. Similar steps can be used to upgrade to any other licensed editions, Developer/Standard/Enterprise.
Changing the edition from the Evaluation edition to another one does not require building and migrating to a new server with the intended edition. As the Evaluation edition is a 180-day trial edition of Enterprise edition, there can be some issues when changing the edition to a non-Enterprise edition due to incompatible features used. This article assumes that the features used in the sample SQL Server instance with the Evaluation edition are non-Enterprise only features.