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Desktop Planner 1.3 is the latest stable version.
Download Desktop Planner v1.3 EXE file, ~1 MiB

If you are not sure if you have the latest version, open the About window in Desktop Planner. If a version number is displayed, it should be 1.3.3.164. If the version number is not there, or if it is lower than 1.3.3.164, you do not have the lastest version, and you should reinstall with the latest version (just reinstall over the top of the current version, you don't need to uninstall)

Desktop Calendar

Desktop Calendar is a trimmed-down version of Desktop Planner. It still lets you set appointments and tasks, but doesn't have the large calendar, full task list, synchronization, automatic update or individual settings.
Download Desktop Calendar v1.0 EXE file, ~600 KiB