• 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.
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  • The Horde component is removed from Plesk Installer. We recommend switching to another webmail software supported in Plesk.
  • The BIND DNS server has already been deprecated and removed from Plesk for Windows.
    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. We strongly recommend transitioning to Microsoft DNS within the next 6 weeks, before the Plesk 18.0.70 release.

Is Plesk 11.5 publicly available?

There's depending on your O/S

Select the desired products and their versions
===============================================================================

The following product versions are available:

1. [*] Parallels Plesk Panel
2. (*) Parallels Plesk Panel 11.5.30 (currently installed)

N) Go to the next page; P) Go to the previous page; Q) Cancel installing
To select a version, type the respective number;
Select an action [N]:

You may want to try the SHELL autoinstaller (if that can help)

Code:
/usr/local/psa/admin/sbin/autoinstaller
 
Try defining the source of packages (if that can help see the new updates) if you are sure you are within the supported O/S.

Code:
/usr/local/psa/admin/sbin/autoinstaller --source=http://autoinstall.plesk.com
 
I have CentOS 6.x & CentOS 5.x. Both supported.

Is it worth the upgrade? Is it likely to break anything?
 
If it's a critical production server (where downtime is not an option) then don't upgrade now ..(you can do that when you are sure of 5hrs of less to no traffic on your server)

I say this because, plesk's upgrade stability is unpredictable ..(while others experience a smooth and clean upgrade, others end up with broken servers and there is no systematic formula as of the cause)

You may also want to try using Parallels Plesk Panel Pre-Upgrade Checker: A tool to identify business logic issues before upgrade or migration

http://kb.parallels.com/en/9436
 
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