While the specific NFO text is a technical manifest, this particular update primarily addressed:
Resolved specific stability issues and minor gameplay bugs reported since the previous build.
Unrar the Dragon.Star.Varnir.Update.v20200407-CODEX.rar file. Run Setup: Execute the setup.exe found inside.
Continued improvements for Windows 10 performance.
After installation, copy the contents of the CODEX folder inside the update into your game directory, overwriting existing files.