Mac OS users are commonly asking for a question how to deal with an application error, which says: “Name.app is damaged and can’t be opened. Delete Name.app and download it again from the App Store.” It occurs when a Mac owner downloads a random application from Mac App Store and attempts to run it.
If a folder (not a disk!) is named “Install macOS Sierra”, “Install OS X Yosemite”, or “Install OS X El Capitan”, delete the folder (you may need admin rights, thus type your admin name and password). Reboot your Mac; Try again. That should do it. Yosemite (OS X 10.10) Mavericks (OS X 10.9) Mountain Lion (OS X 10.8) Lion (OS X 10.7) Download the macOS Sierra installer. Launch the App Store app, then look for macOS Sierra in the store. Open Disc Creator and click the “Select the OS X Installer” button. Find the Sierra installer file. Sudo /Applications/Install macOS Sierra.app. If you want to do a clean install of. How to get an installer for older macOS and OS X versions. If Apple pulled the links for macOS Sierra, macOS El Capitan, and macOS Yosemite from the Mac App Store, there are still a few ways to locate the macOS or Mac OS X version you need. Visit Apple Support’s main page and search. Mac mini introduced in mid 2010 or later iMac introduced in late 2009 or later Mac Pro introduced in mid 2010 or later. To find your Mac model, memory, storage space, and macOS version, choose About This Mac from the Apple menu. If your Mac isn't compatible with macOS Sierra, the installer will let you know.
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