New Installation of syslog-ng Premium Edition 6 failed to start (4282269)

Recently purchased syslog-ng Premium Edition does not start after installation.

# systemctl start syslog-ng

Job for syslog-ng.service failed because the control process exited with error code. See "systemctl status syslog-ng.service" and "journalctl -xe" for details.

# systemctl status syslog-ng

● syslog-ng.service - System Logger Daemon

   Loaded: loaded (/usr/lib/systemd/system/syslog-ng.service; enabled; vendor preset: enabled)

   Active: failed (Result: start-limit) since Mon 2019-01-07 22:35:31 UTC; 2min 3s ago

  Process: 29307 ExecStart=/opt/syslog-ng/sbin/syslog-ng -F --enable-core $SYSLOGNG_OPTIONS (code=exited, status=1/FAILURE)

 Main PID: 29307 (code=exited, status=1/FAILURE)

   Status: "Starting up... (Mon Jan  7 22:35:30 2019"

 systemd[1]: Failed to start System Logger Daemon.

 systemd[1]: Unit syslog-ng.service entered failed state.

 systemd[1]: syslog-ng.service failed.

 systemd[1]: syslog-ng.service holdoff time over, scheduling restart.

 systemd[1]: Stopped System Logger Daemon.

 systemd[1]: start request repeated too quickly for syslog-ng.service

 systemd[1]: Failed to start System Logger Daemon.

 systemd[1]: Unit syslog-ng.service entered failed state. systemd[1]: syslog-ng.service failed.

syslog-ng PE 6 --> Version: 6.0

syslog-ng PE 7 --> Version: Rolling

If the installed version is syslog-ng PE 6 but the license file is generated for PE 7 (Version: Rolling), tThere are two possible ways to resolve this issue.

There could be other reasons why syslog-ng does not start up. For further troubleshooting check "Start syslog-ng in debug mode" section from the Troubleshooting Syslog-ng knowledge base article.