on Premise upgade from 8.1 to 8.2 giving this error Could not load type 'Microsoft.Crm.Sdk.Messages.AppModuleCollection' from assembly 'Microsoft.Crm.Sdk.Proxy, Version=8.0.0.0,

Hi 

i have upgraded a customers D365 from 8.1 to 8.2 recompiled the plugins using 8.2 objects and ran the roll ups to 8.2

im getting this error in event viewer and D365 is not loading

i have checked the C:\Program Files\Microsoft Dynamics CRM\CRMWeb\ folder and Microsoft.Crm.Sdk.Proxy version is 8.2

for some reason its looking for 8.0 i think

Application domain: /LM/W3SVC/1/ROOT-1-133275428880610665
Trust level: Full
Application Virtual Path: /
Application Path: C:\Program Files\Microsoft Dynamics CRM\CRMWeb\
Machine name: ***-CRM-*****

Process information:
Process ID: 3812
Process name: w3wp.exe
Account name: **********\Administrator

Exception information:
Exception type: TypeLoadException
Exception message: Could not load type 'Microsoft.Crm.Sdk.Messages.AppModuleCollection' from assembly 'Microsoft.Crm.Sdk.Proxy, Version=8.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.
at Microsoft.Crm.Application.Controls.NavBar.RetrievePublishedAppModules(Boolean isAppSwitcherShellFeatureEnabled)
at Microsoft.Crm.Application.Controls.NavBar.ConfigureHeader()
at Microsoft.Crm.Application.Components.UI.CrmUIControlBase.ConfigureControlInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Control.PreRenderRecursiveInternal()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Count anyone point me in the right direction to resolve

thanks
R