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MTA:SA fix

MTA file version mismatch or incompatible network module

Install one complete, current MTA. That replaces a mix of old and new MTA files.

The message

Network module not compatible

Codes on this page: CL40

Steps

  1. Close every running MTA

    Close the launcher and the game before you replace MTA’s files.

    Source: MTA help

  2. Install one complete official release

    Run the current official MTA installer for the installation you use. Do not mix netc.dll or other modules from old downloads with a newer MTA.

    Source: MTA help, MTA help, MTA download

  3. Start MTA from the updated copy

    Check that your shortcut opens the installation you updated, then try again from it. If it still reports a mismatch, put the complete module name and the versions shown in your support request.

    Source: MTA help, MTA forum

Still not fixed? Copy the whole message, not only the code, and check your log in the Fix tool. It is read on your own computer.

Other problems like this

Where this comes from

Official MTA guidance

Read on 7 September 2026 and written in our own words here.