• The APS Catalog has been deprecated and removed from all Plesk Obsidian versions.
    Applications already installed from the APS Catalog will continue working. However, Plesk will no longer provide support for APS applications.
  • Please be aware: with the Plesk Obsidian 18.0.78 release, the support for the ngx_pagespeed.so module will be deprecated and removed from the sw-nginx package.

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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