Because of the dependencies between SAS products, you
cannot uninstall a maintenance. 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.