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Updates

Launcher Forge uses file manifests and SHA-256 hashes.
  1. The published build is scanned.
  2. Each file receives a content hash.
  3. A manifest describes the version.
  4. New or modified files are identified.
  5. The launcher downloads the files required by the target version.
A rebuilt or renamed file can receive a different hash even when its visible content appears similar.
Game update process

Manifest comparison and changed-file download