https://wccftech.com/macos-catalina-supplemental-update-released-with-important-fixes/ > Apple has also released a new macOS Catalina Supplemental Update that packs in some extremely important fixes. > It would be wrong to say that macOS Catalina is the best and most trouble-free operating system around. The initial launch was marred with lots of issues and it appears as though Apple has taken note of it all and has fixed many annoyances with the new macOS Catalina Supplemental Update.