Please see the updated version of this utility for handling 4.6.7 and later version of K2 here:
https://community.nintex.com/t5/K2-Five-blackpearl/Process-Version-Migration-Utility/ta-p/175930
Version 3 06: https://community.nintex.com/t5/K2-Five-blackpearl/Process-Version-Migration-Utility-v3-0-6/ta-p/176...