On windows 8.1, with SQL Express I get an error trying to attach the demo database to SQL:

TITLE: Microsoft SQL Server Management Studio
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Attach database failed for Server 'TOMLAPTOP10\LASERFICHE'.  (Microsoft.SqlServer.Smo)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=11.0.2100.60+((SQL11_RTM).120210-1917+)&EvtSrc=Microsoft.SqlServer.Management.Smo.ExceptionTemplates.FailedOperationExceptionText&EvtID=Attach+database+Server&LinkId=20476

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ADDITIONAL INFORMATION:

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.ConnectionInfo)

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The database 'ExternalTables' cannot be opened because it is version 706. This server supports version 663 and earlier. A downgrade path is not supported.
Could not open new database 'ExternalTables'. CREATE DATABASE is aborted. (Microsoft SQL Server, Error: 948)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&EvtSrc=MSSQLServer&EvtID=948&LinkId=20476

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BUTTONS:

OK
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Any ideas?