> ## Documentation Index
> Fetch the complete documentation index at: https://docs.proofcore.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Code 549

If you see the error **Operation Failed With Code: 549** when attempting to run the software, it means the loader has detected an incompatible version of Windows.

## Cause

<Warning>
  **Incompatible Windows Version Detected**

  The cheat cannot operate on your currently installed Windows build. This typically means your version is either too old or a recent update has broken compatibility.
</Warning>

***

## Solution

To resolve this issue, you must verify your current Windows version and, if necessary, reinstall a supported operating system.

<CardGroup cols={2}>
  <Card title="1. Check Compatibility" icon="table" href="/getting-started/compatibility">
    Verify the supported Windows versions to confirm your current build is incompatible.
  </Card>

  <Card title="2. Windows Reinstallation Guide" icon="windows" href="/getting-started/windows-reinstall">
    Follow this guide to install a clean, compatible version of Windows.
  </Card>
</CardGroup>