After downloading a Symantec Endpoint Protection (SEP) Cloud Windows redistributable package, clicking SEPC_Setup.exe does not start the installation, instead, it restarts the package downloader.
Windows client and server operating systems
By design, in it's current configuration, the redistributable package install must be initiated by executing the SEPC_Install.exe file.
The redistributable package install must be initiated by executing the SEPC_Install.exe file.
Additional Contents of the installation package:
SEPC_Setup.exe: In previous builds, this file would relaunch the SEPC installer and install the version of SEPC at that time. In current versions, it will recreate the SEPC installation package. If the installation package version isn't the current version, it is recommended to download a new package creator file through the administration portal.