If you only upgrade from one version of calibre to another, there is no need to do anything. The new version will use the settings from the previously installed version, including the library.
If you are changing to another computer then I would recommend that you do a full reinstall and copy over the calibre library.
It is usually possible to also copy over the files in the configuration folder to also get all the old settings over, but it isn't officially supported. It might cause problems. It could be better to make screen dumps of the relevant dialogs and configure the new install that way.
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