Ensure you have at least 2GB of free space. Restart the Launcher: Fully close the app and reopen it.
Right-click your active network connection and select . Uncheck Internet Protocol Version 6 (TCP/IPv6) . Click OK and restart your launcher.
Before changing your system settings, ensure the problem is not on Microsoft’s end.
In some rare scenarios, error codes like 0x80073cf6 occur when installing games, indicating the drive needs to be configured properly. Ensure you have sufficient space. Summary Checklist Action Required Mods Check for Missing Dependency (Cloth Config API) Fabric Re-install/Update Fabric Loader Files Clear mods folder and re-download mods Launcher Re-install Minecraft Launcher minecraft error 437 download
Many players confuse Error 437 with other issues. To save you time:
A: For the download/version error, no. The error occurs before the game is fully downloaded or launched, so your existing worlds remain untouched in your .minecraft/saves folder. However, it is always recommended to back up your worlds before making significant changes to your game files.
If you are seeing "Error 437" while trying to download or update the game, follow the steps below to resolve the issue. Quick Fixes for Error 437 Ensure you have at least 2GB of free space
Move the entire Minecraft installation to a location without special permissions (e.g., not in AppData or Program Files ).
Open the Start menu, type , and select it.
Error 437 is a common issue that occurs when Minecraft players attempt to download the game. The error message typically reads: "Failed to download file. (437)". This error can occur on various platforms, including Windows, macOS, and Linux. Uncheck Internet Protocol Version 6 (TCP/IPv6)
Are you using the or a third-party one (like CurseForge or Prism)?
If you are using the legacy standalone launcher, it may use outdated protocols that trigger transport errors. Switching to the modern Universal Windows Platform (UWP) app usually bypasses this issue.