Symptoms
K2 Studio fails to start: System.IO.FileLoadException: Could not load file or assembly '[INSTALLDIR]BinSourceCode.Workflow.Interop.dll' or one of its dependencies.
Diagnoses
As can be seen in the error, the placeholder for '[INSTALLDIR]' did not get updated in the 'ConfigurationManager.config'.
Resolution
The location of this file can be found by opening the 'K2Studio.exe.Config file located in '..K2 blackpearlK2Studio'.
A find and replace of '[INSTALLDIR]' with the correct path resolved the issue.