DSP System Toolbox download issue

I installed Matlab (R2020a) essentials trial version, and want to run dsp.MovingRMS function but it is unrecognized function. How do I download DSP System Toolbox? It shows it is part of Matlab essentials but its not running the function.

[Walter Roberson]

https://www.mathworks.com/matlabcentral/answers/101885-how-do-i-install-additional-toolboxes-into-an-existing-installation-of-matlab

[abdulrazzaq aljabali]

%% question 1

x=10

y=4*(x^2)+3*(x)-10

x=23

y4*(x^2)+3*(x)-10

x=-10

y4*(x^2)+3*(x)-10

x=50

y4*(x^2)+3*(x)-10;