Would you be making the updated copies free to all those who already had purchased copies? Do you have the distribution facilities to do that (i.e. I think Amazon has a facility to allow authors to do that but don't know about other sites)?
I personally think you shouldn't tamper with already published works UNLESS it is a major formatting/SPAG issue, and in that case you have to make sure anyone who has brought the book has access to the updated version.
Published books, whilst not perfect, are complete and should be left that way.
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