if you want people to download your most recent theme.
you need to increment the version number.
since clicking on http://vanillaforums.org/addon/kaieteur-theme
takes you to verion 0.9
yet version 0.9b is more recent. http://vanillaforums.org/addon/kaieteur-theme-0.9b
the addons section doesn't place 0.9b as the most recent, you probably want to put up 1.0
I may not provide the completed solution you might desire, but I do try to provide honest suggestions to help you solve your issue.