• Introducing WebPros Cloud - a fully managed infrastructure platform purpose-built to simplify the deployment of WebPros products !  WebPros Cloud enables you to easily deliver WebPros solutions — without the complexity of managing the infrastructure.
    Join the pilot program today!
  • Support for BIND DNS has been removed from Plesk for Windows due to security and maintenance risks.
    If a Plesk for Windows server is still using BIND, the upgrade to Plesk Obsidian 18.0.70 will be unavailable until the administrator switches the DNS server to Microsoft DNS.

Plesk 12.1.8 Beta Linux - how to upgrade

As far as I know Preview Version of Plesk 12.1 is only for fresh installation but not for upgrade.
 
Technically you can do that, though we highly discourage upgrading production servers to preview.
In case of any problem, you won't be able to downgrade or receive support.
Proper path is to clone your server (VPS) and then run Plesk installer with --all-versions option. It will show you preview build for installing
 
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