Arkheron error codes and crash fixes
Every error, crash and connection failure we have a fix for, one page per code. Before the fix, each page says whether the problem is your machine or the studio's servers — because if it's theirs, no amount of verifying game files will help, and the only useful answer is whether it's happening right now.
Things you can fix
Crashes, install faults and driver conflicts. Find your symptom, work the steps in order, stop when it launches.
Arkheron "unknown error" during launch or download (fix)
The game (playtest/demo build) stops partway through launching or downloading — commonly cited around the 16% mark — and shows a generic "unknown error" with no further detail.
Arkheron crashes on launch before the login screen (fix)
Arkheron crashes immediately during the "Launching Arkheron..." step, before the login screen even appears, and triggers Steam's Crash Report Handler. It happens on every attempt, regardless of graphics settings or resolution.
Arkheron "Connection Error - Problem Communicating" (fix)
During queue or match loading, Arkheron shows "Connection Error - Problem Communicating with the server. Please restart the client and you should be prompted to rejoin the match" — and restarting the client doesn't clear it.
Things you cannot
Queues, capacity limits and login failures. These are server-side — every page below links back to live status rather than a fix you can perform yourself.
How these are graded
Every fix step carries a label. Confirmed means players demonstrably got back in with it, or the studio said so directly.Reported means it worked for some people and not others. Unconfirmed means it's circulating and there's no evidence either way yet. The distinction is the point — a page that lists five fixes with equal confidence costs you an evening.