How to downgrade Windows Server 2019 Datacenter Evaluation to Windows Server 2019 Standard

Downgrading from Windows Server 2019 Datacenter Evaluation to Windows Server 2019 Standard is possible, but it's not officially supported by Microsoft. Here's a step-by-step guide to help you through the process:

1. Backup Your Data: Before proceeding, make sure to create a full backup of your server to avoid any data loss.
2. Open Command Prompt: Run Command Prompt as an administrator.
3. Check Current Edition: Verify the current edition of Windows Server installed by running:
   DISM /Online /Get-CurrentEdition
4. Set Target Edition: Use the following command to set the target edition to Standard. Replace XXXXX-XXXXX-XXXXX-XXXXX-XXXXX with your valid Standard edition product key:
   DISM /Online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula
5. Restart the Server: After the command completes restart your server.
6. Verify the Edition: Once the server restarts, verify that the edition has been changed to Standard by running:
   DISM /Online /Get-CurrentEdition

Keep in mind that this method is not officially supported, and there might be risks involved. If you encounter any issues, you may need to perform a clean installation of Windows Server 2019 Standard