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.
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 XT
Some 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 macOS can be done by going to the System Preferences app and under System Update.