When attempting to install an Update Rollup on a Microsoft Dynamics CRM Server, users may encounter errors such as the following:
"Could not load type 'Microsoft.Crm.OrganizationFeatureControlChecks' from assembly 'Microsoft.Crm, Version=184.108.40.206, Culture=neutral, PublicKeyToken=31bf3856ad364e35'."
Non-standard assemblies from a previous version of the Microsoft Dynamics CRM application had been copied into the server's global assembly cache
By default, the only assemblies that the Microsoft Dynamics CRM application has in the global assembly cache are the Microsoft.Crm.SdkTypeProxy.dll and Microsoft.Crm.SdkTypeProxy.XmlSerializers.dll. All other Microsoft Dynamics CRM assemblies should be removed from the global assembly cache.
To view the Global Assembly Cache, please see the link below: