Standard PC Installation Procedure (MATLAB Installation Guide for PC) MATLAB Installation Guide for PC     Installing Additional Products   When you order additional products, The MathWorks sends you a new Personal License Password (PLP). Your PLP identifies all the products you are licensed to install. To install additional products: Shut down MATLAB. Insert the Release 12.1 CD into your CD-ROM drive, or double-click on the file you downloaded from the MathWorks Web site. The installer starts automatically. Follow the instructions on the installer dialog boxes, detailed in Standard PC Installation Procedure. (For concurrent installations, follow the instructions in Concurrent Installation Procedure.) At Step 5, in the Product List dialog box: Specify your current MATLAB installation directory as the installation directory. Deselect all but the product (or products) you want to add. By default, the installer lists all the products you are licensed to install, preselected for installation, not just the new products. When the installation program is finished, perform any configuration required by the new products. See Configuring Certain Release 12.1 Products for more information.  Saving Your MATLAB Preferences Concurrent License Installation Procedure