Diamond Linux-TT is a Linux distribution for desktops based on Stable its version Debian.
Stable version of Debian means security and no problems with updates.
The distribution uses the desktop KDE Plasma aims to make the interface of the operating system to look very familiar to the former users of Windows.
Thus, Diamond Linux-TT distribution means:
• Linux operating system type Windows
• Operating system in 15 minutes
• Linux that does not require special knowledge or skills
• Free operating system for home and office use
Installation instructions
https://www.linux-tt.com/help/
You can download the ISO from here