Please follow these steps to download, install and activate Windows Server 2019 Essentials successfully:

1. Download your Windows Server version from Microsoft’s website:

https://www.microsoft.com/en-us/evalcenter/download-windows-server-2019-essentials  

2. Choose “Windows Server 2019 Essentials” and download the image file 

3. Copy the required files to a DVD or an USB flash drive and perform the installation 

4. To activate Windows Server, run the CMD as admin and perform the following command:

slmgr.vbs /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

(Instead of the X, please enter the product key)