I've just tried hotfix 2.01(4.7281.1.0) on a Trial install of K2BP, running in a vmware virtual machine.
It completed successfully, but (after reboot) when I tried deleting a smart object, it threw the following exception:
SmartObjectServer Exception: Method not found: 'Int32 SourceCode.Dependancy.Interfaces.IDependancyService.RemoveDependancy(SourceCode.Dependancy.Interfaces.IDependancyObject)'.
I reverted to a pre-2.01 snapshot and it works fine. Tried installing the hotfix again and still the same error.
Is there something I've missed?
Thanks

