This may have been addressed, forgive me.. I cannot find

This may have been addressed, forgive me.. I cannot find a thread. I just installed the updated version of MarketPlace ecommerce - i used FTP to transfer the files into my home/website/public/html/wp-conent/plugins. i tried to update the plugin thru wordpress... nothing. it says i have to purchase the plugin, which i did. any thoughts on what went wrong? thanks in advance.