问题
Which SQL Server 2005 Express (means in which service packs) to be install to remove like
this server supports version 611 and earlier. a downgrade path is not supported
回答1:
None. Your server supports Db version 611, which mean it is SQL Server 2005. You are trying to restore or attach a newer version DB (we don't know which, because you choose to cut the message, eliminating what was critical information).
You need to install a SQL Server of a version appropriate for the database you try to restore or attach:
- 612: SQL Server 2005 SP2.
- 655: SQL Server 2008
- 661: SQL Server 2008 R2
- 706: SQL Server 2012
来源：https://stackoverflow.com/questions/26733777/this-server-supports-version-611-and-earlier-a-downgrade-path-is-not-supported