I tried to select no on my encrypted files and now the current submissions appear encrypted and can't be read

If you downloaded the encryption key file, you can use it to decrypt the submissions. Otherwise, the data is lost forever.

So, please disable the encryption feature to avoid losing access to more submissions. And if you need to enable it again make sure to read this guide first: https://www.jotform.com/help/344-Encrypted-Forms-and-How-to-Use-Them