V21015 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:
W29003 manifest for Threaded Kernel Metadata Component 9.4_M3
V01056 manifest for Base SAS 9.4_M3