
If you have a valid license, you can simply reactivate MATLAB.

This happens when your MATLAB license file expires for any of the following reasons.

32bits MATLAB is compatible with 64 bits OS line win 7 or win 8.1. Even if your OS is 64 bit, 32bits MATLAB 2009a must be used. However, you can purchase an existing license and use the above process. You cannot purchase a license if you don’t have a license to MATLAB Compiler R2009a or later. Select the release that you wish to download from the left sidebar. You can connect and share your knowledge in one location that is organized and easy to search. It says that my username is not compatible with the license file. It won’t let me click on the icon on my desktop. Instead of keeping the default one, generated for me, I made a mistake. I accidentally changed my username while downloading MATLAB. This setup would work with 32-bit and 64-bit Windows. This standalone setup and offline installer for MATLAB 2009 are included. This was an earlier version of MATLAB, and it was much less than the Home or Student versions. I don’t believe that these types of licenses are still available. These conditions wouldn’t apply as a new term is in progress.

It will update/renew my license automatically when I click OK. Even though I pay annually for my license renewal, it still sends me a reminder once a year to make sure I have the most current version. If you’re using an institution license, your institution will control whether or not you can download older versions. It can be activated either during or after installation. The license activates itself when you install MATLAB or any other MathWorks Products. You may need to activate your license via the MathWorks License Center if you are using an offline computer.
