Hmm, sounds really weird. There isn't a way to send a fresh copy (not sure what it means too) since GoodTask is distributed through Mac App Store.
One last suggestion would be removing preferences and see how it goes.
Try below and delete preferences file (after closing the app) and reboot, re-open the app.
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Open Finder
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On top menu, choose 'Go > Go to folder..'
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Copy below and move to the folder
~/Library/Containers/com.hahainteractive.GoodTask3Mac/Data/Library/Preferences
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Delete com.hahainteractive.GoodTask3Mac.plist
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On top menu, choose 'Go > Go to folder..'
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Copy below and move to the folder
~/Library/Group Containers/
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Delete U57829932E.group.hahainteractive.goodtask3
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Reboot the device
If this doesn't work, it may be an issue connected to your Apple ID on Mac App Store. In this case, I recommend you to contact Apple directly to resolve the issue.
Thanks!