As I said the libraries are exactly where I would expect them to be - in the folder into which you installed calibre portable G:\My Ebooks\Calibre. Today I would expect the G:\My Ebooks\Calibre\Calibre Library folder to contain one file - metadata.db. But I don't know what might have been put there 5 years ago.
I must admit to being confused, I thought portable calibre was working off your portable drive on the new 8.1 laptop. But I note your G: drive is labelled "Local Drive" which makes me wonder if it might be an internal drive/partition.
I'm going to bow out.
BR
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