E9A004 is a "container" hot fix that contains "member" hot fixes which will update your SAS software components.
See "What is a container hot fix?" in the SAS Hot Fix FAQ for more information on container and member hot fixes.
A manifest listing the contents of each of the following "member" hot fixes is available:
E8U008 manifest for SAS/STAT 15.1
E8Z003 manifest for Base SAS Statistical Procedures 15.1