ChartJs doesn't work on a local downloaded page of Circular Gauge chart example

That demo is accessible in ZIP packages which you can download from ChartJS site
You can open corresponding file

DevExpressChartJS-13.2.7.zip\Demos\VizGallery\demos\Circular Gauges\Basic Elements\Palette for Ranges.html

And modify it.

You also can mofify code directly on page which you linked using online code editor (but you won’t be able to save results)