Error Message: An error has occurred while retrieving document or product access key. Unexpected end of file from server.

The most likely reason for this error message is that the viewer is losing packets due to a poor or inconsistent Internet connection.

If packets are being lost, the viewer can’t check with the server for license rights and the decryption key can’t be properly downloaded.

If this is the case you will need to check your connection and retry when it is stable.