Some legacy FTP mirrors from 2015-2018 used numeric folder names. One archive had a folder /pub/143/ containing SEPM installation files. —never download security software from unverified mirrors.
After downloading SEPM 14.3, follow the installation and configuration guides provided by Broadcom to set up the software. symantec endpoint protection manager download 143 link
The primary method for obtaining the SEPM 14.3 installer is through your licensed entitlements. Some legacy FTP mirrors from 2015-2018 used numeric
The 14.3 release introduced several significant updates to enhance both security and management flexibility: Hybrid Management symantec endpoint protection manager download 143 link