Methods of installing z/OS products
Several IBM® packages are available for installing z/OS® products. Some are entitled with the product (as part of your z/OS license, at no additional charge), while others are available for an additional fee. This section describes each package.
As a rule, because the base elements and optional features are integrated into a single package with compatible service levels, you must install, with few exceptions, the entire z/OS product. See Choosing the z/OS base and optional features for details about this policy.