ApplicationSuite 2019.Winter.1
Upgrading or installing IAS onto a server without connection to Windows Update service, the setup could fail with error message "Unable to install Windows Server 201X roles and features".
The setup is trying to install a windows role that is not already installed; this operation fails whenever the server has no connection to Windows Update service.
installRolesAndFeaturesOneByOne.ps1 -configurationFile .\rolesFeaturesWindowsServer2012R1.txt
or
installRolesAndFeaturesOneByOne.ps1 -configurationFile .\rolesFeaturesWindowsServer2012R2.txt
or
installRolesAndFeaturesOneByOne.ps1 -configurationFile .\rolesFeaturesWindowsServer2016.txt
and then run the setup from command line with /FORCE option.