CIS has started providing the latest version of Symantec Endpoint Protection(14.3 RU1：14.3.3384.1000).
For Windows users
Click 
the link and follow the steps to install or upgrade.
For Mac users
The latest version(14.3 RU1：14.3.3384.1000) is compatible with macOS Big Sur.
Click the link and follow the steps to install or upgrade.