If the original addon is truly abandoned (author hasn't logged onto the site in months and hasn't responded to your messages in a reasonable amount of time) it would probably be better just to transfer ownership of the existing download page. That way, people who already favorite-d the original addon will see your update, and there won't be a useless old duplicate page for the addon.
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Retired author of too many addons.
Message me if you're interested in taking over one of my addons.
Don’t message me about addon bugs or programming questions.
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