Because of the dependencies
between SAS products, you cannot uninstall maintenance updates. However,
when applying a maintenance release, SAS automatically backs up any
files that are modified in the SAS installation directory. It does
not back up any changes that you made to the SAS configuration directory.
Therefore, before installing
a maintenance release, it is recommended that you back up all of the
files in your SAS deployment. If you need to restore a previous deployment
of SAS, it is recommended that you use these backup copies.