BusyCal 1.5.3 is now available. This is a free update available to all users who purchased direct and from the Mac App Store.

What's new:

• Fixed "Application needs to be reinstalled" error on the Mac App Store version
• Korean and Spanish Localization
• Sort by Title option in To Do List
• Fixed default Alarm sound of None
• Improved CalDAV syncing and meeting invitation handling
• Other miscellaneous bug fixes

How to install the update:

• Direct customers can update by selecting Check for Updates from the BusyCal menu.
• Mac App Store customers can update by launching the Mac App Store, selecting the Updates tab, locating BusyCal, and clicking the Update button.
• New users can download the BusyCal 30-day trial.