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How to Resolve Failed Unauthorized Error or Download Failed Error When Updating SchedulePress PRO? #
Usually, this error comes up when you try to update the SchedulePress Pro plugin when your license is not active. Make sure to Activate the License on your website. If you have already done so and you are still facing the issue, you can simply deactivate and then reactivate it. You can also check out this article to manually update SchedulePress.