W66004 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:
W64001 manifest for Advanced Programming for SAS LASR Analytic Server 2.5_M1
U74006 manifest for SAS Threaded Kernel Extensions for LASR Analytic Server 2.5_M1