Today, alongside iOS 14.0.1, Apple has also released a bug fix update to macOS Catalina, with 10.15.7 which actually fixes a few major issues that have been present. One of the issues affected WiFi, where the Mac would not connect automatically to a WiFi network.
Release Notes
macOS Catalina 10.15.7 provides important security updates and bug fixes for your Mac.
– Resolves an issue where macOS would not automatically connect to Wi-Fi networks
– Fixes an issue that could prevent files syncing through iCloud Drive
– Addresses a graphic issue that may occur on iMac (Retina 5K, 27-inch, 2020) with Radeon Pro 5700 XTSome features may not be available for all regions, or on all Apple devices. For detailed information about the security content of this update, please visit: https://support.apple.com/kb/HT201222
Updating
Updating macOS can be done by going to the System Preferences app and under System Update.