How can I use the Differential Equations Editor (dee) with MATLAB R2020a and later?

I am trying to use the Differential Equations Editor which was presented in the following Simulink blog post:

https://blogs.mathworks.com/simulink/2014/10/15/special-vintage-differential-equation-editor/

However, if I enter the command "dee" in MATLAB R2020a, the command is not recognized and the model doesn't open. What happened to Differential Equations Editor, and how can I use it in R2020a or later?

>> dee
Unrecognized function or variable 'dee'.

Answer 1

[MathWorks Support Team]

Differential Equations Editor is an obsolete, undocumented tool that has been removed as of MATLAB R2020a.

Attached to this post is a "dee.zip" archive that contains the last working version of the tool. To permanently add it to your MATLAB installation, add the "dee" folder to your MATLAB path as follows:

>> addpath('C:\path\to\dee\')
>> savepath