Once you have the “Install macOS Catalina” app from the methods above:
Released on September 24, 2020, macOS Catalina 10.15.7 functions as a critical maintenance update, addressing Wi-Fi, iCloud Drive syncing, and iMac graphics issues. This update, followed by a supplemental security patch, serves as a final, stable version for the Catalina operating system. For more details, visit Apple Support Ars Technica Download macOS Catalina 10.15.7 Update - Apple Support macOS Catalina 10.15.7 Download Hub. 1 de out...
It resolved a widespread issue where Macs failed to automatically connect to Wi-Fi networks. Once you have the “Install macOS Catalina” app