Assetto Corsa Is Obsolete V1.16.3 Is Required [2021] Now

The error "Assetto Corsa is obsolete (v1.16.3 is required)" is a common false-positive notification typically encountered when using Content Manager (CM) or the Custom Shaders Patch (CSP). It often occurs because the game’s internal version number (often 1.16.4) is slightly newer than what the third-party tool expects, or due to minor inconsistencies in the game's changelog file. Quick Fixes & Workarounds

Ignore the Message: In many cases, this is purely a visual bug. If your game still launches and runs correctly through Content Manager, you can safely ignore the error. Edit the Changelog (Most Effective):

Navigate to your Assetto Corsa root folder (usually SteamLibrary\steamapps\common\assettocorsa). Locate and open changelog.txt.

Find the very first version number listed at the top (e.g., 1.16.4). Manually change this number to 1.16.3 and save the file.

Verify Integrity of Game Files: Use the Steam Library to right-click Assetto Corsa, select Properties > Installed Files, and click Verify integrity of game files. This ensures you actually have the latest official version. Content Manager & CSP Troubleshooting assetto corsa is obsolete v1.16.3 is required

Here’s a write‑up explaining the error message “assetto corsa is obsolete v1.16.3 is required”, its causes, and how to fix it.

The Hidden Changelog: How CSP Changed Versioning

When Kunos stopped updating the game, the modding community—led by the legendary modder Ilja "x4fab" Jusupov—kept it alive with the Custom Shaders Patch. CSP doesn't just add rain or pretty lights; it rewrites huge chunks of the game’s executable in real-time (via a technique called "DLL injection").

As CSP evolved, modders started building features that required specific CSP versions. Eventually, server hosts began using a feature within CSP that checks the client’s reported game version.

Here is the catch: Modern versions of CSP (specifically versions 0.2.0 and above) trick the game into reporting a fake version number to the server to ensure compatibility. Specifically, many server configs look for 1.16.3 because that was the last stable "vanilla" version before CSP fundamentally altered the netcode. The error " Assetto Corsa is obsolete (v1

If your CSP is too new, too old, or misconfigured, the server sees your version mismatch and kicks you with the "obsolete" message.

How to Fix "Assetto Corsa is Obsolete v1.16.3 is required"

You have three solutions, ranging from the simple to the nuclear. Start with #1 and work your way down.

Is Your Assetto Corsa Obsolete? Decoding the "v1.16.3 is Required" Error

If you are a sim racer who enjoys the limitless world of modding in Assetto Corsa, you have likely been greeted by a frustrating red wall of text recently. It appears when you try to join a specific online server or launch a particular modded car. The message reads:

"Assetto Corsa is obsolete. v1.16.3 is required." The Hidden Changelog: How CSP Changed Versioning When

For the casual driver, this error is confusing. You bought the game on Steam. It updates automatically. How can it be "obsolete"? Why is it asking for a version number that doesn't seem to exist in your Steam library? And most importantly: Do you actually need to downgrade, or is there a fix?

Let’s break down exactly what this error means, why it is happening in 2024/2025, and how to fix it without breaking your entire mod library.

1. The "Opt-In" Steam Beta (The Legacy Fix)

Many old tutorials tell you to right-click Assetto Corsa in Steam -> Properties -> Betas -> Select "v1.16.3 - public". Be careful with this. If you roll back your Steam version to 1.16.3, you will lose compatibility with modern CSP and almost all 2024/2025 mods (No Hesi, SRP, etc.). This is usually the wrong move.

How to check current version in-game

Open Assetto Corsa → main menu bottom-right (or About/Help screen) shows the version number (e.g., v1.16.3).

Step 1: Verify your Steam version is current

Go to Steam -> Library -> Assetto Corsa -> Properties -> Betas.
Ensure it is set to "None." (You want the latest Steam build, usually 1.16.4).

The "Copy to Steam" Workaround (For Launcher Users)

Do you use Simagic or Moza dedicated launchers? Do you launch AC through SimHub or Crew Chief directly?

Sometimes, these launchers spawn a hidden instance of AC that bypasses Steam's version check.

The Fix:

Open Content Manager.
Go to Settings -> Assetto Corsa -> Patch.
Look for "Force 32-bit mode" or "Force Steam API" . Toggle these settings.
Alternatively, copy your clean acs.exe into the root directory of your launcher, not just the game folder.