On Windows, it should be under Z:\Users\<user>\Roaming\AppData\calibre\, adjusting for drive letter. (The shorter version is %AppData%\calibre\, but that'll open your system's folder, not the old one.)
Note that the AppData folder is hidden by default. I unhide it, but Windows Updates love to re-hide it....
Empty out any files that happen to be in the same location in your new system and copy them over from your old drive. Then open Calibre and see if it takes.
Last edited by ownedbycats; 12-18-2020 at 08:14 PM.
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