Windows licenses available through Volume Licensing are upgrade-only licenses. They do not replace the base, “qualifying” licenses for operating system software that comes preinstalled on new PCs. Each PC that runs the Windows 10 Pro or Enterprise upgrade must first be licensed to run one of the qualifying operating systems identified below—otherwise the PC will not have a valid, legal Windows license. If you don’t have a preexisting license for a genuine, qualifying operating system on your PC, see the Get Genuine Options section in this guide.
Each of these conditions must be met in order for a base PC to be eligible for an upgrade license:
- Software under the qualifying operating system license must already be installed on the device to which you will assign the Volume Licensing upgrade. See the chart below of versions that are eligible for upgrade.
- You must remove the existing qualifying operating system from the device in order to deploy the Volume Licensing upgrade license, unless the device or user is covered by Windows Software Assurance.
- If you who want to install or run more than one licensed operating system at one time (including the qualifying operating system) you have the option to attach Windows Software Assurance to your Volume Licensing upgrade license.