You log in to your Easypano account and you will find your keys for TW 3.0 and yes you can turn the Encryption off when using Flash.
It is possible that the files were uploaded to your clients server computer and been corrupted or not uploaded the correct way I.E: ASCII vs Binary.
It is also possible that the clients computer needs to have the MIME settings added for the .jpe image format.
It is also possible that not all the files have been uploaded. I have also seen "webmasters" unzip the zip files before uploading.
Could also be that the swObject.js needs to be renamed without the caPs swobject.js (Flash Tours).
and there is a known issue with encrypted .txt files .tx1 and MIME types.
One or some may be relevant in this case. I just thought I'd list what I can remember.