Starting with version 3.17, Little Green Button requires the installation of Microsoft .NET Desktop Runtime v8 (x86) or higher. If this is not already installed, the installer will prompt you to download and install this.
This Framework can also be downloaded from the Microsoft .NET downloads page.
An .msi is not supplied for .NET, but the .exe that can be obtained can be used in 'silent' installation scenarios:
A command like the below will silently install the required .NET version:
\\path\to\windowsdesktop-runtime-8.0.xx-win-x86.exe /install /quiet /norestart
Explicit troubleshooting regarding installing this is outside the scope of this article, but you can find more information on the Microsoft Docs.