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You have to first install the current version to go back (on Windows at least).
Note that uninstalling Calibre does not remove your Calibre settings and ebooks library so that they are still there if you install the earlier version.
Going backwards is not always possible as sometimes the metadata.db file used with the current release is incompatible with earlier releases. If you want to guarantee you can revert you should make a copy of this file before upgrading. so that you can reinstate it if you need to revert (although note that doing so will lose any changes made in calibre after the point you made the backup).
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