Visual Studio C++ 2017 Redistributable Requirement
ArcGIS Desktop requires Microsoft Visual C++ 2017 Redistributable (x86) Update 5. If the Visual C++ 2017 Redistributable is not already installed, running setup.exe will install it before setup.msi is launched. Setup.msi will not install if Microsoft Visual C++ 2017 Redistributable (x86) Update 5 is not already installed.
.NET Support
ArcGIS Desktop requires Microsoft .NET Framework Version 4.5. If .NET Framework 4.5 is not detected on your machine, the ArcGIS Desktop setup will not proceed.