Oh god now your asking.
I have never used this either as I updated all my content so I have only had this error once.
Richard is our script Guru and if he has any sense he will be in bed now, unlike me. He is in the same time zone as me.
It’s simple to use - I’d make it a custom action, or open it with File>Merge, while viewing the folder with the content in the Content Library pane - that way the file selector will open in the right place. Select one or more files in the folder, click Accept, and it will do its thing. Don’t go looking for files in the \data folder - the script expects to be given user files, usually in \People\Genesis\some folder, and will then find the data files from there. The script creates a .bak file for each file it edits - one in the library folder, one in the \daat folder, so that you can go back if it fails. If you do a lot of conversions and they are working you might want to use the OS search to find and remove the .bak files.
So my thinking is Go to the Content Library Pane, (not Smart Content) select the problem content go the File > Merge browse to where the script is stored on your hard drive and click accept.
Sorry I can’t help further.