Hi Gunter, is it possible you didn't unzip the files?

The other possibly way you could get a script error message like that is if UnwrapCurve was not recognized as an installed command. When MoI does not recognize the text as a command name it will also try to execute it as script code and you would get that type of script error that you show.

But in order to get that there would need to be some problem with the installation - either files not unzipped or files copied into some other folder like /ui rather than /commands, so double check that...

- Michael