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 15 Jul 2021
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.

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More Answers (38)

chi nguyen dinh
chi nguyen dinh on 11 Oct 2021
I cannot open Matlab 2021b.
  1 Comment
matteo tondini
matteo tondini on 30 Nov 2021 at 17:05
I had the same problem, in my case Matlab first installation was incomplete.
The Matlab uninstall.exe wasn't been downloaded so i had to cancel all the file from the folder in C://Program..., then i reinstalled Matlab. In my case it has worked.

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Emre Yildiz
Emre Yildiz on 28 Oct 2021
Hallo, after the complete installation of MATLAB my macOS device won't open the programm ?

Ramamohan Tummala
Ramamohan Tummala on 29 Oct 2021
Edited: Walter Roberson on 29 Oct 2021
I did not understand that this package is already installed
can I continue installation
  1 Comment
Walter Roberson
Walter Roberson on 29 Oct 2021
Yes, you can continue installation. The installer will install any products that you asked to install that are not already installed.

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Paul Hamilton
Paul Hamilton on 7 Nov 2021 at 14:42
How do I access R2921b. I seem to have already installed this software but when I boot up the MatLab application it still goes to R2021a and opens that version.

EDILBERTO FRAGOZO MARENCO on 12 Nov 2021 at 19:32
The installation was not achieved, that is the reason why I need to do the installation again.
the shortcut does not appear on my desktop

NAVEEN V on 24 Nov 2021 at 10:38
i cannot open matlab because after insalliation i closed the window without activation.And now i dont have activation key, matlab is not opening on terminal.


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