Want to change to a different language? Upgrade from your current version’s language to Parallels Desktop 5 for Mac in another language — it’s your choice!
Want to revert back to an earlier version? If you’re going back to Parallels Desktop 3.0 for Mac you will have to uninstall Parallels Desktop 5 for Mac and reinstall the earlier version, because Parallels Desktop 5 for Mac updates your virtual hard disk format to provide the ability to recover from failures using snapshots.