Symptoms
After installing K2 4.6.11 for Visual Studio 2015, K2 for Visual Studio 2012 throws the following error on load:
The 'WorkflowPackage' package did not load correctly.
The tools version "4.6" is unrecognized. Available tools versions are "14.0", "2.0", "3.5", "4.0".
Diagnoses
This issue was reproducible and a bug was logged for investigation to be fixed in a future update.
Resolution
A fix is available to allow K2 to work with both VS 2012 and VS 2015.