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

Why do I receive the following warning when re-installing MATLAB or additional toolboxes?

Products Already installed:

All selected products are already installed.

Answer 1

[MathWorks Support Team]

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:

How do I uninstall or reinstall MATLAB on a Windows computer?

How do I uninstall MATLAB on a MacOS machine?  

How do I uninstall MATLAB products on a Linux machine?

Reinstalling a particular toolbox, other than MATLAB

If you would like to reinstall a particular toolbox, you must first uninstall the toolbox:

How do I uninstall a toolbox without uninstalling MATLAB?

Once uninstalled, you may proceed with the installation.

[P Vibhute]

I can't open matlab don't know y.

[Verizon DT]

This is really a bad answer from Matlab/Mathworks. The installer tool should determine if what needs to be installed/uninstalled to move forward. The user shouldn't have to be bogged down with this minutia.

[Walter Roberson]

How is it a bad answer? The tool does figure out what needs to be installed or uninstalled to move forward.

The scenario it is designed for is that some toolboxes are already installed, and the user goes back into the installer and asks to install several toolboxes including some toolboxes already installed. For example the user might have added toolboxes to the license and goes into the installer and asks to install everything, using the tick box that selects everything. The installer then warns "You already have some of those installed, I will skip installing those." How is that a bad design?

The responses that I am seeing here appear to be mostly from people for who installation failed part way for some reason, and are looking for a way to reinstall.

It might possibly be a good idea to have a "force reinstall" option in the installer. However... if you have an installation that is corrupted enough that you cannot run matlab (as people seem to be experiencing) then is rewriting the files going to be sufficient, or is it going to leave the garbage around that might interfere with the reinstalled version? If you have those kinds of problems, then is it perhaps better to uninstall everything and install again?

[Verizon DT]

Walter - clearly, there are many people having this problem. The main issue is you get to a point in the installer and it just gets stuck. I'm glad you aren't having any problems, but for those of us that do, Matlab needs to know this and address it.

[Walter Roberson]

@Verizon DT

Does the Mathworks answer describe what does happen? If so, then how is it a bad answer?

Wanting MATLAB to do something different than it currently does, does not mean that an accurate description of what it does is a "bad answer" .

"The installer tool should determine if what needs to be installed/uninstalled to move forward."

Are you saying that the installer tool should be able to analyze the currently installed files and the complete system configuration, and fix the software and system configuration so as to be able to install? That would be... a challenge.

For example, on the Intel Macs with Trusted Platform Module, if there is corruption of an HFS+ transaction log on the boot partition, then the only way to fix it is to boot into an in-memory-only operating system and enter the EEPROM password to unlock the encrypted parts of the partition, and hope the recovery works; if it does not work then the only sanctioned way to proceed is to erase the entire hard drive ( all partitions) and reinstall. It is common that your first notice that you have this problem is a notice from Time Machine that it had problems backing up, so your backups might or might not be corrupted... and might be stored on the same drive, of course... A bit much to expect a program such as MATLAB to be able to detect and fix, in my opinion.

[Ekanthappa J]

get it installed

[Devendra Singh]

i want to install all selected tools or update all selected tools.

[ensherah saeedi]

yes

[ensherah saeedi]

i want to open beacuse to stydy for my king abdulaziz universty so plesee open it quacly ok

[Jimmy Willie Woulo]

When i open the mathlab the program wont open, it just read unziped files

[盛书 许]

there is something wrong with my mathlab

[José Valdir Spadacini]

because I had problems installing and had to re-download the software.

[盛书 许]

Reinstall the computer system, or format the disk installed with MATLAB and then go to the official website for installation

Answer 2

[ALDAIR CERVANTES]

Porque me aparece esto almomento de instalar la versión mas reciente de matlab?

[SHILPA THYAGARAJU]

y this command appearing and not letting to go furthur

[özge durna]

this command appearing,what should i do?

[Walter Roberson]

@özge durna

What do you need to accomplish?

[Joyeuse Kampire]

i can not open Matlab

[Ailyn Sánchez Hernández]

Yo tuve que instalar un Support

[David Hernández]

Y como es eso del suport??

[ensherah saeedi]

yes

[maha alshaya]

yes

[usman kamara]

yes

[abbas Yusuf balarabe]

i have the same problem

[盛书 许]

Reinstall the computer system, or format the disk installed with MATLAB and then go to the official website for installation

Answer 3

[chi nguyen dinh]

I cannot open Matlab 2021b.

[matteo tondini]

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.

[怡婷 赵]

i have already uninstalled all the matlab's documentary,but i still be stucked in this process

[Rogers Matte]

i need simulink

Answer 4

[Claudia Puente]

because I had problems installing and had to re-download the software.

Answer 5

[Iulia Raluca Ica]

i didint select to appear on desktop the program

Answer 6

[Guan-Chyun Hsieh]

After I installed, I cannot finish the final process. I guess that the installation may not be finished.

[Miguel Flores]

i have the same problem by problems in excel

Answer 7

[SAVADOGO Assani]

Mt first installation was not finished

Answer 8

[Miguel Flores]

Because i have problem with EXCEL an lose interface y need reinstale

Answer 9

[Ljiljana Milic]

I cannot start Matlab R2021b since I didnot completed instalation properly.

[Reem Alshyoukh]

I didnot completed instalation and I cannot start Matlab R2021b

Answer 10

[Amrita Pal]

i am installing on a different account

Answer 11

[Julio César Sigueñas Pacheco]

I cannot open Matlab 2021b

Answer 12

[Mekdes Eyayu Mequanint]

My first installation was not finished

Answer 13

[Emre Yildiz]

Hallo, after the complete installation of MATLAB my macOS device won't open the programm ?

[Walter Roberson]

Did you check in System Preferences -> Security & Privacy pane, "General" tab, to see whether you need to grant permission to run the code?

[Ramamohan Tummala]

no

Answer 14

[Ramamohan Tummala]

I did not understand that this package is already installed

can I continue installation

[Walter Roberson]

Yes, you can continue installation. The installer will install any products that you asked to install that are not already installed.

Answer 15

[Israel Palma Quiroz]

The installation was not achieved, that is the reason why I need to do the installation again

[Walter Roberson]

Delete the entire MATLAB installation directory in C:\ and then install again.

Answer 16

[Narci Jimenez Alvarado]

me aparece que debo resolver la respuesta

Answer 17

[Marco Yeh]

I change PC

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/100663-how-do-i-deactivate-matlab?s_tid=srchtitle

https://www.mathworks.com/matlabcentral/answers/99859-how-can-i-deactivate-matlab-on-a-machine-i-cannot-access

Answer 18

[Mothusi Boapotswe]

i am failing to complete the installation

[Walter Roberson]

Use your system facilities to delete the MATLAB installation directory. Then reinstall MATLAB.

Answer 19

[Rovic Umandap]

I uninstalled matlab

Answer 20

[Paul Hamilton]

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.

[Walter Roberson]

@Paul Hamilton

Which operating system are you using?

Answer 21

[gopi h]

i failed to install the softwate during installation

[Walter Roberson]

Use your system facilities to delete the MATLAB installation directory. Then reinstall MATLAB.

Answer 22

[Aycheh Hurani]

The installation was not achieved, that is the reason why I need to do the installation again

Answer 23

[EDILBERTO FRAGOZO MARENCO]

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

Answer 24

[Bernard De Vera]

it says that Matlab has been installed but i cannot where is the dashboard?

Answer 25

[Vyshnavi Arram]

ok but i want again to my folder

[Walter Roberson]

Use your system facilities to delete the MATLAB installation directory. Then reinstall MATLAB.

Answer 26

[NAVEEN V]

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.

[Prois]

Same, what did you do ?

Answer 27

[Eva Vaz]

I want again on my folder

[Walter Roberson]

Use your system facilities to delete the MATLAB installation directory. Then reinstall MATLAB.

Answer 28

[Stanislaus Ding]

I Want to try

[Walter Roberson]

Use your system facilities to delete the MATLAB installation directory. Then reinstall MATLAB.

Answer 29

[Phisit Wannakham]

I don't know.

[Walter Roberson]

Use your system facilities to delete the MATLAB installation directory. Then reinstall MATLAB.

Answer 30

[Jyotin Gokli]

I have uninstalled MATLAB still it gives me same error

[Walter Roberson]

I think you are going to need to contact Mathworks for free installation support.

Answer 31

[Wissarut Jarassopon]

I uninstalled matlab

Answer 32

[Zoher Chiba]

I had a trial Matlab for 1 month. I have now purchased a home license. I believe I have to uninstall the trial Matlab brfore I install my home licensed Matlab. How do I do that?

[Walter Roberson]

@Zoher Chiba

See https://www.mathworks.com/matlabcentral/answers/1602690-how-to-switch-to-purchased-license-after-using-the-free-trial-license#answer_847310

Answer 33

[Saadou MAHAMANE]

i uninstalled

Answer 34

[Abdulmalik Alshunaifi]

i uninstalled

[k sreekanth]

unable to open 2021b

Answer 35

[Lubos Vargovcik]

I requested an extension of the original trial by 30 days

[Walter Roberson]

The volunteers who answer questions here do not have access to the license database. You will need to contact Mathworks Sales to request extensions for any trial license.

Answer 36

[karthik sk]

the MATLAP trIial by 3-0 days is expreid so extension to requested to install the MATLAB

[Walter Roberson]

The volunteers who answer questions here do not have access to the license database. You will need to contact Mathworks Sales to request extensions for any trial license.

Answer 37

[Yitayal Ewnetu Chanie]

I can't integrate android studio to matlab simulink.

Answer 38

[Marc Adrianne Guevarra]

just did to format the app

Answer 39

[Muhammad Ashhad Khan]

Actually I had changed the user name while I was installing the matlab and my pc account name is change now i wanna to reinstall it

Answer 40

[Simon Green]

Installaltion did not go as it should have

Answer 41

[Margarita Toapanta]

puedo volver a instalar matlab?

Answer 42

[Rimantas Barauskas]

I've got a message that the license expires in 12 days

[Walter Roberson]

@Rimantas Barauskas

If you purchased the license yourself then you will need to purchase a renewal, or else the license will stop working.

If you did not purchase the license yourself, then contact whoever purchased the license for you.

Answer 43

[jorge ivan gallegos rosales]

por que me manda aqui y no abre matlab?

Answer 44

[智仁 罗]

some toolbox cannot be opened

Answer 45

[Emiliana Moreno]

por que aparece instalado y no esta instalado

Answer 46

[Ebram Fahim]

I can not open my matlap

[evan kung]

I　ｃａｎ　ｎｏｔ　ｏｐｅｎ　Ｍａｔｌａｂ

[Bem]

I installed trial version and period of trial version expires.

Answer 47

[Devendra Singh]

i want to updated or installed my trail software.

[Walter Roberson]

If somehow you are moving to a new trial version of MATLAB, then use the uninstaller to remove the old trial version.

If you obtained a new (extended) trial license, then in the command window

Help -> Licensing -> Update current licenses

Answer 48

[Rafael Alberto Pech Uc]

no puedo abrilo ayuda

Answer 49

[Robert Estrada]

It's not working properly

[Walter Roberson]

What symptoms are you observing?

[Jing Bai]

I want to re-install the MATLAB 2021b

Answer 50

[DIEGO JOEL GUZMAN UMAJINGA]

I want to re-install the MATLAB 2021b

Answer 51

[ntabala benoit]

i lost my computer with the application installed on the machine, now am failling to activate the app into the other computer

[Walter Roberson]

@ntabala benoit

See https://www.mathworks.com/matlabcentral/answers/99859-how-can-i-deactivate-matlab-on-a-machine-i-cannot-access?s_tid=srchtitle

Answer 52

[LUCA PAOLINI]

for university

[Samira Mohammadi]

hi im ricived all selected products already instale and i cant continua instal .what am i donig now?

[Walter Roberson]

Use your system facilities to delete the MATLAB installation directory. Then reinstall MATLAB.

Answer 53

[Urmi Pandya]

because matlab is already installed in your PC

[Walter Roberson]

Use your system facilities to delete the MATLAB installation directory. Then reinstall MATLAB.

Answer 54

[Mohammed ZIANI]

I cannot open Matlab 2021b

[Walter Roberson]

It is not clear how this is related to the "Products already installed" situation ?

Answer 55

[Dagnover Largo Bueno]

i cant opne matlab 2021b

[Walter Roberson]

It is not clear how this is related to the "Products already installed" situation ?

Answer 56

[Fatimata Guiro]

I uninstalled matlab

[Walter Roberson]

It is not clear how this is related to the "Products already installed" situation ?

Answer 57