Windows Server lets you change a server's edition in place using DISM with the /Set-Edition (or /Online /Set-Edition) option and a valid edition key, which upgrades Standard to Datacenter without requiring a full reinstall and needs only a single restart to complete, minimizing downtime for the Hyper-V host and preserving its running virtual machines and configuration. Setup.exe would perform a full in-place OS upgrade rather than an edition change, which is unnecessary and far more disruptive when the OS version itself is not changing, slmgr.vbs manages license activation rather than edition conversion, and convert.exe is unrelated (it converts file systems). DISM is Microsoft's documented tool for this specific Standard-to-Datacenter edition upgrade scenario, and running DISM /Online /Set-Edition:ServerDatacenter /ProductKey:<key> /AcceptEula is the documented command sequence for completing it with a single reboot. After the reboot, the server retains its existing roles, features, and settings, including the Hyper-V role and any virtual machines already configured, since an edition change preserves the installation rather than replacing it.