Symptoms
Client is updating K2 for SharePoint and is receiving the following error:
Method not found: 'Void SourceCode.SmartObjects.Services.ServiceSDK.Objects.ServicePackage.set_AllowFallbackToSelf(Boolean)'
Diagnoses
This error seems to be thrown when a dll is outdated or not of the current version. We provided client with the 4.6.9 version of the dll as that is the software version she installed.
Resolution
Client backed up the old dll, and replaced it with the new one provided by support, reran her K2 for SharePoint set up and it completed successfully.