Marco Zaro focused on stabilizing the installation workflow and improving code reliability in the mg5amcnlo/mg5amcnlo repository. He addressed user friction during external dependency setup by refining error messaging and path guidance for the pineappl configuration executable, reducing installation failures. Using C++ and leveraging his skills in error handling and compiler warning resolution, Marco migrated power-related variables to uint32_t in the pineappl interface, which suppressed build-time warnings and improved type safety. His work emphasized code hygiene and maintainability, ensuring that future development would encounter fewer distractions from compiler issues and that the installation process would be more robust.