Justinian

How to run

Five steps, and one rule that matters.

The rule: start it only inside a match

Every cold start, run Justinian only after you are in a match.

A cold start is any time the game has just been launched: after a reboot, after closing the game, or after a crash. On a cold start, load into a match first, and only then start Justinian. In the lobby the overlay has nothing to attach to, so it can fail to lock on or take minutes to recover.

Step by step

◆
I

Get the app

Download Justinian.exe from the Download page with your license key (a free trial key works too).

II

Start the game

Launch Arc Raiders as usual and play through the menus. Leave Justinian closed for now.

III

Load into a match

Queue up and wait until you are standing in the map and controlling your character. Not the lobby, not the loading screen.

IV

Now run Justinian

Double-click Justinian.exe. A console window opens. The first time it asks for your license key: paste it once. After that it signs in on its own.

V

Wait for the lock-on

The console prints that it found the game and the players, then the overlay appears. Give it up to a minute. Keep the console window open while you play.

Before you begin

  • Windows PC with 64-bit Python 3.10 or newer installed (tick “Add python.exe to PATH”). The app tells you if it is missing.
  • A license key: bought on this site, or a free 3-hour trial key.
  • An internet connection. The license is checked with our server every time the app starts.
  • Close any older Justinian window before starting a new one.

After the first run

  • It will not ask for the key again on the same PC.
  • Between matches you can leave it running; it re-attaches when the next match loads.
  • If you restart the game completely, that is a cold start again: load into a match first, then run the app.
  • The license counts down on our server, so changing your PC clock changes nothing.

If it does not work

  • Nothing appears: close Justinian, make sure you are in a match, and start it again.
  • “Already activated on another device”: a key works on one PC. Release the old PC from your dashboard, or use another key.
  • “Free trial already used on this PC”: each PC gets one trial. Buy a license to continue.
  • “License has expired”: get a new key from the plans.
  • “Could not reach the licensing server”: check your internet connection and try again.
  • Still stuck? Send us the file %LOCALAPPDATA%\Justinian\justinian.log.
Download the app