From the Microsoft LTSC info: > If you fail to activate this evaluation after installation, or if your evaluation period expires, the desktop background will t

From the Microsoft LTSC info: > If you fail to activate this evaluation after installation, or if your evaluation period expires, the desktop background will turn black, you will see a persistent desktop notification indicating that the system is not genuine, and the PC will shut down every hour. I was ready to grab a ISO, but this sounds pretty user hostile to me.