I hate going back the forth.  It is working again.  The link I posted above has not been updated yet, it is still waiting to be pushed.  The location to the unpushed version that works is here. https://github.com/EmpireProject/Empire/blob/7a39a55f127b1aeb951b3d9d80c6dc64500cacb5/data/module_source/credentials/Invoke-Mimikatz.ps1   That one will definitely work.  I was confused when I went into the one I listed before and saw the date of the mimikatz.