: This denotes the English (United States) language pack.

Because fewer background processes are running, it uses significantly less RAM and CPU power than Windows 10 Home or Pro.

: DirectX 9 support with WDDM 1.0 or higher drivers. Display : Resolution of at least 800 x 600 pixels. "Lite" & Pre-activated Versions Скачать Windows 10 Enterprise LTSC 2019 - Comss.one

: This likely refers to the release date. Windows 10 Enterprise LTSC 2019 was released to manufacturing on October 18, 2018, and was made available for retail purchase on January 15, 2019. It's based on the Windows 10 version 1809 (October 2018 Update) codebase.