CIS has started providing the latest version of Symantec Endpoint Protection(14.2 RU1 (14.2.1)：14.2.3335.1000).
For Windows users
The latest version(14.2.1 RU1) is compatible with 
Windows 10 May 2019 Update.
Click the link and follow the steps to install or upgrade.
For Mac users
Click the link and follow the steps to install or upgrade.