uninstall your older version of wazapp, remove it. Delete .db file, in home/user/wazapp folder (get the app filebox from store if you don't know how to delete in terminal/console) Search thread latest .deb file - download it in your phone - click on it and install. You need to have the option enabled to install program from other source in your phone settings. If you need more info search thread, it's all there.