SWG is EOL according to Symantec Website.
Version Name 5.2.2
Release Type
MAINTENANCE
A Maintenance Pack provides cumulative bug fixes for a particular Major Release or Minor Release of Licensed Software, but contains no new features or functionality. It is generally installed as an overlay - also known as a patch.
Release Date
December 15, 2014
End of Support Life
December 7, 2019
Last date to contact support.
End of Engineering Life
December 7, 2017
Last date for patch releases.
End of Life
December 7, 2015
End of Life means the day that a Symantec product enters a process to wind down distribution and the delivery of technical support services.
https://support.symantec.com/en_US/web-gateway.58161.html