Microsoft Visual C++ 2015-2019 (x86) is required. The Esri Installation Guide notes that setup.exe will attempt to install this if missing.
ArcGIS 10.8 requires Python 2.7.18 and Numerical Python (NumPy) 1.16.6, which are typically included in the "Complete" installation type. 2. Downloading the Software install arcgis 108
Locate and download the self-extracting executable (e.g., ArcGIS_Desktop_108_172737.exe ). 3. Step-by-Step Installation Process Follow these steps to install ArcMap on your machine: ArcGIS Desktop 10.8.x system requirements Microsoft Visual C++ 2015-2019 (x86) is required