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It should only appear once, is it still occurring this time?
I checked it here and I was not prompted with the upload your private key window.
Please let us know if you are still experiencing this so we can investigate this further.
I turned off the encryption on the form, but the responses that had already come in are still encrypted. I'm not sure why I cannot find the key on my computer. Should it be there automatically?
You are usually prompted to create a private key which you can download and save to a location in your computer.
Check you downloads folder its should be a file with the name "jotform.key"