Move the library folders out of Y:\Calibre Library\Lou's Books\ into Y:\Calibre Library\ with your file manager. Then do what I said before.
Get it going like that and make sure you can install a new version etc.
Then create a Test library in Y:\Calibre Library\ and see if you can move that library into the Y:\Calibre Library\Lou's Books with calibre - I don't know if it works in portable.
BR
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