Please check if below link helps with Windows server essentials ISO download.
Since Windows 10 home could not enable hyper-V to create a VM, we could prepare another new hard disk drive for installing the Windows Server 2019 Essential on the PC. By this way, we could keep the original Windows 10 home system in the old drive.
Below links are for your reference to create server 2019 essential USB key.
rufus download link
Create Bootable Windows Server 2019 USB
Create Windows Server 2019 bootable USB (Rufus)
After creating the USB key, you could plug the USB to your new PC. If your BIOS settings are properly set-up, the computer will directly boot to the Windows Server 2019 Essential installation screen.
This "Windows Server General Forum" Forum will be migrating to a new home on Microsoft Q&A, please refer to this sticky post for more details.