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I see that your account is currently having a total of 454 submissions. Please be noted that the Free subscription accounts are limited to store only 500 submissions and so you have received the notification. I notice that you have already tried exporting the form data and the file created is not working. It seems that there is an issue with creating the compressed file using the form data.
Let me forward the issue to our backend team to take a look. Once we have any update in this regard, you'll be posted here.