Install Arcgis 108 Exclusive -

ArcGIS 10.8

I notice you're asking about installing "ArcGIS 108" — but there is no official version (the correct versioning is ArcGIS 10.8.x, not "108").

If you encounter any issues during the installation process, refer to the Esri website for troubleshooting guides and technical support resources. install arcgis 108