Sorry to hear about the trouble, we'll try our best to help you with it. Could you please try the steps shared below:
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This will not solve it. I tried closing everything Adobe related I could find in the task manager. Started Adobe XD again and you are still stuck in a cycle of a modal poping up and closing over and over again. Only option is to close the modal and when you do it, it will also close Adobe XD completly.
This is strange. I would suggest you to please get in touch with us directly using this link: https://helpx.adobe.com/contact.html so that you can get the immediate assistance on the issue.
Hope it helps.