Unrar the Dragon.Star.Varnir.Update.v20200407-CODEX.rar file. Run Setup: Execute the setup.exe found inside.
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) Dragon.Star.Varnir.Update.v20200407-CODEX.rar
Continued improvements for Windows 10 performance. Unrar the Dragon
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
Resolved specific stability issues and minor gameplay bugs reported since the previous build.
Point it to your existing Dragon Star Varnir installation folder.