Step 1
download and install node.js
Step 2
add nodejs path to environment variable 'Path'
Step 3
Restart windows, let Path variable take effect.
Step 4
use CMD test whether node.js is success by type node -v, if you see version number, then it success
Step 5
You must login ESRI developer website, then download experience builder
https://developers.arcgis.com/downloads/#web-appbuilder
Step 6
select the version you need
https://developers.arcgis.com/web-appbuilder/downloads/
Step 7
unzip, extract file
Step 8
Step 9
Step 10
Step 11
Step 12