Install the necessary modules

Open a Command Window.

Navigate the Server folder:

C:\DAVID\EXB\EXB2\server\

cd C:\DAVID\EXB\EXB2\server

Enter npm ci

You will find a new folder named node_modules

C:\DAVID\EXB\EXB2\server\

C:\DAVID\EXB\EXB2\server\node_modules\

You have successfully downloaded all the required modules to run the Developer Edition of ArcGIS Experience Builder.