You cannot run ArcGIS Server without a valid license file ( .prvc or .ecp ). You should generate this from the same portal before you begin the installation.
: Complete the end-user information and download the generated file to a safe location. 3. Key Prerequisites to Check Download ESRI ArcGIS Server Enterprise
: Find the "ArcGIS Server" setup file under the core components section and start your download. 2. Generating Your License File You cannot run ArcGIS Server without a valid license file (
: Sign in to My Esri with an account that has "Downloads" permissions. Download ESRI ArcGIS Server Enterprise