I have two encryption files and I don't know how to replace the old one with the new one, help!

Please note that each encryption key is unique, so one can not replace the other. Please try uploading one of the encryption files to decrypt your submissions. You may log in to a new browser to upload the file.

I would suggest you to also check this guide related to the encryption feature: https://www.jotform.com/help/344-Encrypted-Forms-and-How-to-Use-Them