Some members of LEDStrain, including myself, use old builds of Windows 10 since eyestrain troubles began with build 1607 and later.
.NET Framework 4.8 has only been available on Windows 10 build 1607 and later, and builds 1507/1511 were limited to 4.6.2. Many applications require .NET Framework 4.8.
It is possible to install 4.8 on 1507/1511 thanks to the clever work of abbodi1406 on MDL. Here is a link to his .NET 4.8 Installer/Updater for Windows 10 Version 1507/1511. I have tested it and it is working on one of my 2015 LTSB (1507) installs.