How do I get an RSU?
You get an RSU by ordering a current preventive service deliverable as you usually do, for the products you need. Use ShopzSeries on the Web for z/OS service.
When you place the order for your preventive service, you'll get service for all the products you specified in your profile. If you order service for products we do not test in the CST environment, you'll still get all the service specified in your profile. In addition, you'll receive RSU ++ASSIGN statements for all the service - both CST tested and non-CST tested service get an associated RSU ++ASSIGN statement.
See Getting an RSU for complete information on getting and installing recommended service.