why do i get connection error while installing the MATLAB

Answer 1

[Cris LaPierre]

If you haven't seen it already, try the suggestions in this post

Also, check your proxy and antivirus settings (see this post)

If you are using Windows 10, try this post.

If none of those work, create an install support request with MathWorks Support: www.mathworks.com/support/contact_us/