Hi Deepak,
The following MATLAB Answer might help with the issue: Why do I see the error "Something Unexpected Occurred" when installing MathWorks Products - https://www.mathworks.com/matlabcentral/answers/489806-why-do-i-see-the-error-something-unexpected-occurred-when-installing-mathworks-products.
If the issue persists even after following the steps on the above MATLAB answers post, please contact MathWorks Support - https://www.mathworks.com/support/contact_us.html.
Hope this helps!