Unrar the Dragon.Star.Varnir.Update.v20200407-CODEX.rar file. Run Setup: Execute the setup.exe found inside.
Since this is an update release, it requires the base game (specifically the Dragon.Star.Varnir-CODEX release) to be previously installed. How to Use Dragon.Star.Varnir.Update.v20200407-CODEX.rar
The "proper" (NFO) for the release details a minor update for the PC version of the game. Release Details Game Name: Dragon Star Varnir Update Version: v20200407 Group: CODEX Release Date: April 7, 2020 (as indicated by the filename). Update Notes (NFO Summary) Unrar the Dragon
Point it to your existing Dragon Star Varnir installation folder. How to Use The "proper" (NFO) for the
Resolved specific stability issues and minor gameplay bugs reported since the previous build.
For community-verified technical data and file checksums, you can check scene databases like xrel.to or PreDB.me. Dragon Star Varnir Patches and Updates - SteamDB
After installation, copy the contents of the CODEX folder inside the update into your game directory, overwriting existing files.