Ah, right. Sorry this is all a tad confusing. Where can I get the LTS 2019 Datacenter edition ISO? I found a post from another of the main Windows 10 threads, with a link to Code: @en_windows_server_2019_updated_june_2020_x64_dvd_7757177c.iso . Would that work with the key?
The ISO includes following editions: Windows Server 2019 Standard Windows Server 2019 Standard (Desktop Experience) Windows Server 2019 Datacenter Windows Server 2019 Datacenter (Desktop Experience) Windows Server 2019 Datacenter (Desktop Experience) should be what you are after.