Your end clients (other Windows Server 2019 machines) will use the you downloaded. On those machines, you do NOT install a KMS host key. Instead, you install the KMS Client GVLK .
For testing or if you lack immediate access to the portal, you can download the Windows Server 2019 Evaluation ISO . windows server 2019 kms iso link
If you have a volume license agreement, you must download the ISO from the Microsoft 365 Admin Center Your end clients (other Windows Server 2019 machines)
If you do not yet have a KMS host key but want to test the setup, you can download a 180-day evaluation ISO from Microsoft Evaluation Center. Note: You cannot convert an evaluation copy to a KMS host without a reinstall. For testing or if you lack immediate access
Microsoft also offers a KMS host container for Docker and Kubernetes environments. Instead of downloading a full 4GB ISO, you can pull a lightweight Windows Server Core image from Microsoft Container Registry and configure it as a KMS host. This is ideal for modern DevOps environments.
Microsoft provides two primary official channels for obtaining Windows Server 2019 media: