Why do I receive "Products Already Installed" when installing MATLAB or additional toolboxes?

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Why do I receive the following warning when re-installing MATLAB or additional toolboxes?
Products Already installed:
All selected products are already installed.

Accepted Answer

MathWorks Support Team
MathWorks Support Team on 22 Aug 2023
Edited: MathWorks Support Team on 16 May 2022
As of R2021b, the MathWorks Installer will provide a warning message if you attempt to reinstall products that are already installed.  The MathWorks Installer will not automatically uninstall and reinstall software. Please see below for instructions on:
  • Uninstalling MATLAB
  • Reinstalling a particular toolbox
Uninstalling MATLAB
To reinstall MATLAB, you must first uninstall MATLAB, then you will be able to proceed in the installation.  For instructions on how to uninstall MATLAB on each supported Operating System, please refer to the following links:
Reinstalling a particular toolbox, other than MATLAB
If you would like to reinstall a particular toolbox, you must first uninstall the toolbox:
Once uninstalled, you may proceed with the installation.
  6 Comments
Walter Roberson
Walter Roberson on 11 May 2023
For MacOS, drag the application out of /Applications into the trash, and empty the trash. You might also want to delete the appropriate folders out of ~/Library/Application Support/MathWorks/MATLAB/ such as R202b and R2022b_licenses
For Windows, delete the installation folder, and empty the recycling bin. You might want to run a third-party utility to detect registry problems and clean the registry afterwards. You might also want to delete the appropriate folders out of C:\Users\username\AppData\Roaming\MathWorks\MATLAB such as R2022b and R2022b_licenses
Kenneth Freeman
Kenneth Freeman on 15 May 2023
Thanks,
I ended up installing to a different location and that seemed to work. I can use your suggestions to clean up the old install. Don't know what happened with that, matlab.exe just disappeared from my machine.
Ken

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