tkhawkeye I am also having the same issue with the PCO token. I keep getting the same 'authentication failed' error. I could be totally wrong, but I think it has to do with OpenLP referring to the Client ID as an Application ID.
For importing the ProPresenter Files. I haven't been on ProPresenter in a while. I think I had to export the song library and not use the repository files. There used to be a button that, with the library highlighted, you could hit File -> Export Document, then pick between Propresenter 5, 6, or plain text. Is that not on 7?
Sorry if that's not helpful.