SP2010 Rest services ListData.svc not working in RTM

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If you want to use the ListData.svc / Rest service in the SP2010 RTM you might get this error:

 Could not load type ‘System.Data.Services.Providers.IDataServiceUpdateProvider’ 
from assembly ‘System.Data.Services, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089′

Then install this update, which we forgot to install with SP2010 RTM

"An update is available that provides additional features and improvements for ADO.NET Data Services in the .NET Framework 3.5 SP1 on a computer that is running Windows 7 or Windows Server 2008 R2"

https://support.microsoft.com/kb/976127