Each section covers the upgrade from the previous LTS release, the section on 2.568.1 covers the upgrade from 2.555.3.
For users who must use Windows for their agent images and are stuck on Windows 2019, the workaround is either to:
Upgrade to Windows Server 2022 or Windows Server 2025
Build their own agent image for Windows Server 2019
More details are available in the blog post.
No notable changes requiring upgrade notes.
For users who must use Windows for their controller and are stuck on Windows 2019, the workaround is either to:
Install Jenkins controller via the MSI available via the "Windows" links on /download/.
Build their own image.