I am afraid I could have misled you a bit. In fact Telerik OpenAccess ORM is installed with three more assemblies that do not start with the Telerik.OpenAccess prefix that I assume you have not deleted. You will have to redo the steps but this time remove the Telerik.Data.Dsl, Telerik.Data.DslPackage and Telerik.Data.VsFileGenerator assemblies as well.
I am sorry for the inconvenience caused.
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