Right now I'm on 10.8.3 with this software installed: Adobe Reader 11.0.04 µTorrent 1.8.4 VLC 2.0.8 Skype 6.9 (513) Twitter 2.3.1 Vox 1.2 Google Drive Dropbox Google Chrome 30.0.1599.101 LibreOffice 188.8.131.52 Stufflt Expander 15.0.7a FileZilla 3.7.3 WineBottler 184.108.40.206 XQuartz 2.7.4 (xorg-server 1.13.0) PS3 Media Server 1.90.1 1. I want upgrade to Mavericks but I'm afraid some of my software mentioned below will not work correctly. How can I know which software work or not? 2. What is the recommended way to upgrade? update via Mac App Store or make clean install?