: This is the major build number for Windows 10 version 20H2.
This specific version (Build 608) was a critical "polishing" update. It arrived just weeks after the initial launch of 20H2 to fix several early bugs, including issues with the "Meet Now" button in the taskbar and various stability fixes for the Japanese Input Method Editor (IME). 19042.608.201019-1901.20H2_RELEASE_SVC_PROD3_CL...
: Confirms this belongs to the specific development branch for the second half of 2020. : This is the major build number for Windows 10 version 20H2
: This is the timestamp indicating when this specific "flavor" of the code was compiled: October 19, 2020, at 7:01 PM. officially retiring the legacy version.
: This version was the first to come pre-installed with the new Microsoft Edge browser based on Chromium, officially retiring the legacy version.