The update is specifically designed to introduce an encryption that blocks a couple of noted security vulnerabilities, most obviously, the issue with port 8000. It is intentional that this also causes the PC Zviewer software to stop working.
All devices are being updated in order to be as secure as possible when the Cloud recording services are rolled out. Any devices without the encryption will not work with the cloud services. There will also eventually be an update to the mobile apps that will prevent non-encrypted devices from being viewed on MeShare and Zmodo.
We recommend against rolling back to the less secure apps, since they are less secure, and support for them will be phased out. If you are still interested in rolling your device back to the less secure firmware version, email our support team at firstname.lastname@example.org with your device ID, and we can send you a link to download the older version.
Do not post your device ID on the forum.