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Sathya,
You can change save.download = 'CanvasJS.png'; in first example to your desired name. Here CanvasJS.png is the image-file name. And in the second example, you can use exportFileName to set image-file name.
save.download = 'CanvasJS.png';
Download location setting is a part of browser setting, it varies from browser-to-browser. You can change it under browser settings. Check these links to change/manage download location in chrome and Firefox.
— Vishwas R Team CanvasJS