Paulo Chang maintained and improved the reliability of the lizongying/homebrew-cask repository by delivering a targeted update to the Movist Pro Homebrew Cask. He addressed a critical issue by correcting the SHA256 checksum for version 2.13.0, ensuring that users installing via Homebrew Cask receive the correct and verified package. This work reduced the risk of installation errors and reinforced version accuracy within the Homebrew ecosystem. Paulo applied his expertise in Ruby and package management to implement and document the fix, demonstrating a focused approach to maintaining software integrity and supporting the ongoing stability of open-source package distribution workflows.