You downloaded latest packages like 16.0RU2 or 16.1 and you cannot find the Symantec_DLP_Plugin_Email_Quarantine_Connect.exe responsible for integration with SMG.
16.0RU1
16.0RU2
16.1
There were no new versions of this plugin since 16.0 release.
The plugin provided in 16.0 package is the latest version and is supported with newer releases. Please download Symantec_DLP_16.0_Platform_Win-IN_16.0.00000.60853.zip from the support portal to get the latest Symantec_DLP_Plugin_Email_Quarantine_Connect.exe. The file is located under Symantec_DLP_16.0_Platform_Win-IN_16.0.00000.60853.zip\DLP\16.0\SMG folder.