License Management (MATLAB Installation Guide for PC) MATLAB Installation Guide for PC     Running Multiple Versions of MATLAB If you want to continue running a previously installed version of MATLAB after you install MATLAB 6.1, note the following: The previously installed version of MATLAB must be 5.2.x or higher. Both versions of MATLAB must use the latest version of the license manager (FLEXlm). MATLAB 6.1 requires FLEXlm 6.1g. Replace the processed License File that your previous MATLAB installation uses with the processed License File created during the installation of MATLAB 6.1. Note    Because MATLAB 6.0 (R12) and MATLAB 6.1 (R12.1) both use FLEXlm 6.1g, you can run both versions of MATLAB on the same system without reinstalling the license manager. For earlier releases of MATLAB, you must reinstall the license manager. To set up this configuration, follow these instructions: Shut down your previously installed version of MATLAB. Stop the license manager. (See Starting and Stopping the License Manager.) Remove the license manager service. (See Installing the License Manager as a Service.) If your existing MATLAB installation is version 5.2.x or 5.3.x, you must reinstall the license manager, using the procedure described in Concurrent Installation Procedure in Chapter 2. At step 7 in the installation procedure, install the license manager as a service and start the license manager service. (See Starting and Stopping the License Manager.) Install MATLAB 6.1 on your client systems. (See Installing MATLAB on a Client System.) Replace the License File used by your existing MATLAB client installations with the License File created by the installer during the new client installations. This table lists the License File locations for different MATLAB releases. MATLAB Version Location of License File MATLAB 6.x $MATLAB\bin\win32\license.dat MATLAB 5.2.x or 5.3.x $MATLAB\bin\license.dat If your existing installation is MATLAB 6, replace the license.dat file in the $MATLAB\bin\win32 directory with the file from the same directory in your new installation. If your existing installation is MATLAB 5.2.x, replace the license.dat file in the $MATLAB\bin directory.  License File Running MATLAB with Other FLEXlm Applications