“Failed to download file. Name: [filename]. Reason: 437” or simply “Error 437: Download UPD.”
To fix the problem, you first need to know what is likely causing it. Based on user reports from early 2026, the most common triggers for the "Unable to update the Minecraft Native Launcher" error include: Minecraft Error 437 Download UPD
If a restart doesn't work, the next step is to clear the launcher's cache. Don't worry, this will not delete your saved worlds. “Failed to download file
Scroll down to and click Add or remove exclusions . Click Add an exclusion and choose Folder . Based on user reports from early 2026, the
Find the assets folder and delete its contents (not the folder itself). Restart the launcher and attempt the update again. 4. Reinstall the Minecraft Launcher
If none of the above worked, you are dealing with deep system-level conflicts.