WARDOGS WD-L020 Error Fix: Why the Game Won't Launch (Windows 11 KB5124010)

If WARDOGS suddenly refuses to launch and throws a WD-L020 error, you did not break anything and your save is fine. This is a known launch crash tied to a specific Windows 11 update that Microsoft shipped on September 22, 2026 — and the developer, BULKHEAD, has already acknowledged it publicly.

Here is what the WD-L020 error actually is, the official statement from Team17 Support, and the confirmed workaround if you can't wait for the patch.

Quick answer: what is the WARDOGS WD-L020 error?

WD-L020 is a launch-time compatibility crash caused by the Windows 11 preview update KB5124010 (released September 22, 2026). It stops WARDOGS from starting on affected PCs. Team17 Support has confirmed the cause and is working on a fix. The only working self-service workaround right now is to uninstall Windows update KB5124010 and restart — which is optional and done at your own risk. Nothing is wrong with your account, your progression, or the game files.

Is it your PC or a WARDOGS problem?

It's not your PC. The error started appearing for players who installed a specific optional Windows update, not because of a bad WARDOGS install or a corrupted save. Three facts make that clear:

• The error is environment-specific, not account-specific — it triggers on launch, before you ever reach a match, and reinstalling the game does not fix it.
• It is new (late September 2026), and it lines up exactly with the release date of one Windows update rather than any WARDOGS patch.
• The developer has publicly acknowledged it and named the cause, which almost never happens with genuine per-player corruption.

WARDOGS itself is very much alive while this plays out. At the time of writing the game had 137,537 players in game concurrently on Steam, and its review score sits at "Mostly Positive," with 67,557 of 87,138 user reviews positive (about 78%). So if you're seeing WD-L020, you are hitting a temporary Windows-side incompatibility on a game that is running fine for most of its player base.

What is Windows 11 update KB5124010?

KB5124010 is the trigger. According to Microsoft's own support documentation, "September 22, 2026—KB5124010 (OS Builds 26200.9550 and 26100.9550) Preview" is an optional preview update for Windows 11 versions 24H2 and 25H2 — a non-security "preview" build that ships ahead of the normal monthly security rollout.

Two things matter here:

• It is a preview / optional update, not a mandatory security patch. That means it is safe to uninstall without leaving your system unpatched against the month's security fixes, and it is also easy to have installed by accident if you have optional updates turned on.
• Because it is a preview build, it changed something at the OS level that WARDOGS' launcher does not yet expect — which is exactly the class of bug that produces a clean "won't start" error code like WD-L020 rather than a mid-match crash.

What has BULKHEAD said about WD-L020?

Team17 Support (Team17 publishes WARDOGS for developer BULKHEAD) posted an official statement in the Steam community discussions confirming both the cause and a workaround. In their words:

"We are aware that some players have recently started encountering a WD-L020 error when launching WARDOGS. Our preliminary investigation has identified a potential compatibility issue related to the latest Windows 11 update, KB5124010... Our team is actively investigating the issue and working on a solution."

They also confirmed the rollback path directly: "If you would prefer not to wait for a fix, rolling back Windows update KB5124010 may allow you to launch the game again," while stressing that "removing a Windows update is entirely optional and should be done at your own risk."

So the developer's position is clear: a proper fix is on the way, and the KB5124010 rollback is an interim measure — not a required one.

How do you fix the WARDOGS WD-L020 error right now?

If you want to play before the official patch lands, uninstalling KB5124010 is the confirmed workaround. This is the exact sequence Team17 Support published:

• Open Start > Settings.
• Select Windows Update.
• Select Update history.
• Scroll down and select Uninstall updates.
• Locate KB5124010 in the list.
• Select Uninstall and follow the on-screen instructions.
• Restart your PC once the update has been removed, then launch WARDOGS again.

A few things to keep in mind before you do it:

• Removing a Windows update is optional and at your own risk, per Team17. If your PC is otherwise stable and you're comfortable waiting, the safest move is simply to wait for the patch.
• If you don't see KB5124010 in the uninstall list, you probably never installed it — in which case your WD-L020 error may have a different cause (verify your game files through Steam first).
• Once BULKHEAD ships the compatibility fix, you can reinstall KB5124010 normally through Windows Update.

Should you just wait for the official patch?

For most players, yes. BULKHEAD/Team17 said they are "actively investigating the issue and working on a solution," and because KB5124010 is only a preview update, sitting on the previous build for a few days costs you nothing on the security side. If you're mid-grind through the Season 1 XP curve and don't want to touch your OS, waiting is the low-risk choice.

If you play daily and can't afford to lose the days before Season 2, the rollback gets you back in immediately. Either way, this is a temporary, Windows-triggered launch bug — not a sign that WARDOGS is unstable or that your account is at risk.

How do you avoid this happening again?

• Pause optional/preview updates. In Windows Update settings you can turn off "Get the latest updates as soon as they're available," which stops preview builds like KB5124010 from installing automatically. You'll still receive the important monthly security updates.
• Verify game files before assuming the worst. In Steam, right-click WARDOGS > Properties > Installed Files > Verify integrity of game files. This rules out a corrupted install so you know a launch error is environmental.
• Check the official channels first. When a brand-new launch error appears across many players at once, the cause is almost always an update or a server issue — the Steam discussions and the developer's posts will confirm it faster than any third-party site.

Frequently asked questions

What causes the WARDOGS WD-L020 error? A compatibility conflict between WARDOGS and the Windows 11 preview update KB5124010, released September 22, 2026. Team17 Support has confirmed this is the cause and is working on a fix.

Is the WD-L020 error my account or my save? No. WD-L020 is a launch-time error triggered by your Windows version, not by your account or your progression. Your Cash, levels, and save data are unaffected.

How do I fix WD-L020 without waiting for a patch? Uninstall Windows update KB5124010 (Settings > Windows Update > Update history > Uninstall updates > KB5124010 > Uninstall), then restart your PC and relaunch WARDOGS. Team17 notes this is optional and done at your own risk.

Is it safe to uninstall KB5124010? KB5124010 is an optional preview update, not a security update, so removing it does not leave you missing the month's security fixes. Team17 still frames the rollback as optional and at your own risk, and you can reinstall it once the game patch is out.

Will there be an official WARDOGS fix? Yes. Team17 Support stated the team is "actively investigating the issue and working on a solution." Once the compatibility patch ships, you can reinstall KB5124010 normally.

Is WARDOGS down or dead because of this? No. This is a launch bug for players on one specific Windows build. WARDOGS had 137,537 concurrent players and a "Mostly Positive" review score at the time of writing.

Related WARDOGS guides

• WARDOGS Season 1 XP Curve: Why Leveling Is So Much Slower at Launch
• Is WARDOGS an Extraction Shooter or Battle Royale? What It Actually Is
• WARDOGS Season 2 Start Date Is October 15 — The Wipe and What to Do First
• Is WARDOGS on PS5, Xbox or Game Pass? Console & Platform Guide

Sources: Team17 Support official statement, Steam community discussions (WARDOGS, appid 1867240); Microsoft support documentation for KB5124010 (September 22, 2026 preview, OS Builds 26200.9550 / 26100.9550); Steam concurrent player and user review data (retrieved September 25, 2026).