As a workaround you may use the table designer feature in SQL Server Management Studio 2008 to edit table schemas in SQL Server 2008.
This update does not support the following features for SQL Server 2008:
Only servers up to Microsoft SQL Server 2005 are supported.”
This update resolves the following error that when you try to use Microsoft Visual Studio 2005 Service Pack 1 design tools to open a database connection to Microsoft SQL Server 2008 :