I too get the same error message, I uninstalled DIVX and ran a registry cleaner after I used REVO Uninstaller to ensure all remnants of DIVX are gone. I still get the same error message. Still dll wasn't deleted. I did run Search Everything and it found two of the same, one in the x86 and regular 64 bit folders. I did delete and the copying works.
As far as Supercopier goes, It is not user friendly at the least. Plus, it doesn't recognize my tablet in My Computer.