When user opened the below Security Response site to download 11.1.x & 11.5.x Patch Assessment Content Updates 2019-1, user found the 12.x PACU 2019-1, but he can't find the 11.1.x & 11.5.x PACU 2019-1 on Security Response site.
According the below information on Security Response site, Symantec will not release the 11.1.x & 11.5.x PACU from January 2019. And if user wants to update the new PACU, he needs to upgrade the CCS to 12.x version.
Windows standards for raw-data based content (RBC) UNIX patch updates for raw-data based content (RBC) Comprehensive standards for Windows and UNIX patches for the message based content (MBC)
Notes: PACU is applicable only for CCS 11.0 or later versions.
From October 2015 onwards, the PACU support for the message based content (MBC) for CCS 11.x has been discontinued. From December 2015 onwards, the PACU support for the raw-data based content (RBC) for CCS 11.0 will be discontinued. From January 2019 onwards, the PACU support for the raw-data based content (RBC) for CCS 11.x is discontinued. To continue receiving patch updates for RBC, we recommend that you upgrade to CCS 12.x