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You haven't said which plugin, if it is the one not hosted on these forums we don't talk about here then as with all questions about it you need to go to the blog for it.
Other than that, installing an older version of calibre is a case of downloading the installer for it, which I think are on SourceForge. There are dozens of posts around the place discussing this subject, just do a search. Don't go back too far unless you have your library backed up from that previous version or you may have database issues.
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