How can I pause the download on Mac App Store and then resume it later? I am downloading macOS Sierra from Mac App Store. But I have electricity problem here. Due to which my iMac will lose power after 2 hours. Now I want to pause the downloading so that I can resume the download later on. How can I do that?

Here is a screenshot.
Open Launchpad and you will see your downloading app. Simply click on the app icon to pause the download, and click it again to resume.