Updated to WP 3.3.1. Installed Marketpress, but only MarketPress Lite is appearing in my plug ins

I deactivated Marketpress Lite, then supposedly installed MarketPress 2.4.2. but it’s not showing up in my plug-ins list. When go to add new and then search Marketpress, it says it’s already installed.

Does this have anything to do with this warning I’m getting at the top of the page?…If so, HOW do I correct this?

“Your backup folder MIGHT be visible to the public

To correct this issue, move the .htaccess file from wp-content/plugins/wp-dbmanager to /home/thewor29/public_html/wp-content/backup-db”