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Upgrading v8.2 to 11.1

Trying to upgrade a major product from Infragistics 8.2 to 11.1.  The upgrade utility fell over uselessly so I have attempted the upgrade manually.  So far so good.

I have one problem however - 

Error 42 The type 'Infragistics.Win.UltraWinToolbars.UltraToolbarsManager' is defined in an assembly that is not referenced. You must add a reference to assembly 'Infragistics2.Win.UltraWinToolbars.v8.1, Version=8.1.20081.2150, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb'. D:\LaytonProducts\AuditWizard\Layton Framework\Cab\Interface\LaytonWorkItemController.cs 75 17 Layton.Cab.Interface

There are no references anyway in my solution to v8.2 on Infragistics now however I do have a reference to
This I assume is the problem as this will still be the v8.2 version.  I have looked all over but cannot find a v11.1 version of this file and of its dependancies.  
Please help ASAP as I can't get any further.