Connection Error when installing add on

When I click "Sign in to Install", it shows this. I read the support article, turned off the anti-virus, tried adding the environment variables, changed networks, but still shows this.

Answer 1

[Cris LaPierre]

Try the suggestions mentioned here:

https://www.mathworks.com/matlabcentral/answers/92634-why-do-i-get-a-connection-error-when-installing-or-activating-matlab-or-another-mathworks-product

You might also find helpful suggestions here

https://www.mathworks.com/matlabcentral/answers/182042-support-package-installer-can-t-connect-to-mathworks-any-ideas

[Nandha Shree]

Still not working... Please help...

[Cris LaPierre]

If you are still experiencing this issue, please contact MathWorks support:

http://www.mathworks.com/support/contact_us/

[Nandha Shree]

Yes... Thanks a lot!