Two products have license-related changes in R2013a. To use the latest version of each product, you must have a subscription to MathWorks Software Maintenance Service (SMS) as of R2013a.
As of R2013a, Fixed-Point Toolbox and Simulink Fixed Point have been merged and renamed Fixed-Point Designer. Both Fixed-Point Toolbox and Simulink Fixed Point are no longer available for purchase individually.
Not subscribed to SMS as of R2013a for either Fixed-Point Toolbox or Simulink Fixed Point or both
Your license will be updated to include Fixed-Point Designer 4.0 at no initial cost. You will need to renew your SMS subscription to access the updated product.