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Be sure to click "Deactivate" in the Settings menu (Preferences menu, on a Mac) before you uninstall! This frees up an activation on your account. Since we don't track your computer directly, that's the only way our system can know that a copy of the software is being taken out of service.
Uninstalling is relatively easy - on the Mac, simply drag the application icon into the trash.
On Windows, you can uninstall it from the Control Panel's Add/Remove Applications area, or by locating (or downloading) the installer, running it, and selecting the "Uninstall" option when you're offered the choice.
If you run into any issues during this process, please don't hesitate to get in touch with the support team here.