Diamond Linux-TT is a Linux distribution for desktops based on Stable version of Debian.
Stable version of Debian means security and no problems on updates.
The distribution uses the KDE Plasma desktop to make the operating system interface look very familiar to former Windows users.
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 use in home and in the office
Instructions installationς
https://www.linux-tt.com/help/
You can download the ISO from here