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https://www.vspbreda.nl/nl/workstation-os/windows-8-1-2012-r2-how-to-add-new-product-keys-to-your-kms-server-upgrade-your-vamt-3-0/
Windows 8.1 /2012 R2: How to add new product keys to your KMS server / Upgrade your VAMT 3.0