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Go to https://www.skype.com/ in your browser. It's a blue button in the middle of the page. This will prompt the Skype setup file to begin downloading onto your Mac. Skype will automatically detect that you're using a Mac, thus ensuring that you get the correct file. This can take a few seconds to a few minutes depending on your Internet connection. Double-click the downloaded Skype setup file to open it. If prompted, verify the download in your Mac's System Preferences before proceeding. In the DMG file's window, click and drag the Skype app icon onto the "Applications" folder icon, then release the mouse button. Skype will install onto your Mac. It may take a few seconds for Skype to finish installing. This folder is on the left side of the Finder window. Alternatively, you can click the Go menu item at the top of the screen and then click Applications in the resulting drop-down menu. If Finder isn't currently selected, you won't see Go at the top of the screen. Find the Skype app icon and double-click it. This will open Skype's login page. Enter your Microsoft account email address (or phone number, or Skype username) and password to do so, then follow any on-screen instructions. Once you're logged in, you'll be able to use Skype as you please.
Open the Skype website. Click Get Skype. Wait for Skype to finish downloading. Open the Skype DMG file. Install Skype. Click Applications. Open Skype. Log into Skype.