Delve is a web-based, online tool. There is no software that you need to download to your computer. Delve will work with any computer with a browser, including (but not limited to):

There is no off-line, desktop version of Delve.

Delve is designed with an automatic save feature that ensures all your project data is securely stored as you work. This means there's no need for you to manually save your progress at any point.