Upgrade Database Diagrams from Previous Editions (Visual Database Tools)
Applies to: 
SQL Server
Database diagrams created on previous editions of SQL Server databases are upgraded automatically when database diagramming is set up on SQL Server. For more steps for setting up diagramming see Set Up Database Diagram Designer.
To upgrade legacy database diagrams
From Object Explorer, expand the database.
Expand the Database Diagram node under the database.
Select Yes when prompted if you want to set up database diagramming.
This will upgrade diagrams stored on the database.
See Also
Understand Database Diagram Ownership
Set Up Database Diagram Designer
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