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launcher • Workaround

Error 3003: NMD invalid MD-file header

The downloaded metadata file does not contain the header the launcher expected, usually because the metadata download was incomplete or altered in transit.

Recommended steps

  1. Restart Launcher
  2. Disable Proxy or VPN
  3. Try a VPN
  4. 1.1.1.1 DNS Only
Verified build: SC Alpha 4.9 • Last checked: 2026-08-27