If your Mac asks for admin credentials when installing or upgrading Skype, follow these steps.
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Download the latest Skype installer (.dmg file) from Skype.com.
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After downloading, open the installer file by double-clicking it.
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Do not install Skype by dragging and dropping the Skype app in this window.
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Open Finder and locate your personal Applications folder.
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It's typically at Macintosh HD/Users/[your username]/Applications/ .
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Drag and drop the Skype app from the Skype Installer window to your personal Applications folder.