I tested the October 2018 CU and found out that is bug. The requirement was to have Service Pack 1 before installing the update but that was not the case in our environment where our DEV is not at Service Pack 1 level. The patching was successful in DEV. However, the October 2018 CU failed in our staging farm with SP1. I am wondering if anyone has the same issue.
The October CU 2018 bits failed where the farm is SharePoint Server 2013 Service Pack 1 while it was successful in other farm without SP1.
I am wondering if MS tested this CU before releasing it.