It's a pretty usual that you open an app but showing "damaged and can't be opened" on new installed macOS Sierra. Safari 10 brings a new feature to disable plug-ins like Adobe Flash Player, Java, Silverlight, QuickTime and uses HTML5 to load content for a faster browsing experience. Open Safari > Preference > Show Develop menu in menu bar > Develop > Empty Caches.
The Windows version with same functions is available for Windows 10 and lower versions.įree Download for Win 7 or later 5. WinX MediaTrans Mac version, one of the best replacements of iTunes, offers a quite simple and reliable way to transfer files, including photos, videos, music, books, Voice Memos, ringtones, podcasts between Mac (OS Sierra) and iPhone, iPad, iPod.
Please note that if you fail to update iTunes, download the latest version straight from Apple instead of updating from App Store.Īctually, iTunes receives a lot of complaints for its complicated operation, various bugs on syncing and more which driving some users to switch to iTunes alternatives.
To solve this problem, you just need to install iTunes 12.8 or higher from Mac App Store. It's not unexpected that iTunes won't open or work after installing/upgrading your Mac to macOS Sierra. Remove all third party extensions, antivirus apps, PPTP VPN software.Reset SMC: Shut down Mac > unplug all cables > plug cables back a few minutes later > start up Mac.Sierra won't startĪlso, some other troubleshooting tips can be used to solve this macOS Sierra problem. Release the keys when you hear the second sound to reset PRAM. Restart your Mac and hold down Command, Option, P and R keys simultaneously. MacOS Sierra is installed successfully but goes to a failing startup only with a grey screen. macOS Sierra Won't Start Problem after Installing/Upgrading Next, press power button while holding down the Shift key to boot your Mac into Safe Mode. If this problem remains after that, try to install macOS Sierra in Safe Mode.įirst of all, make sure that the network situation is great.Disable or uninstall any antivirus software on Mac.Another problem which frequently happens is that macOS Sierra freezes during installation.In that case, you should delete this damaged installation app and download it again from the Mac App Store. macOS Sierra Installation Problemsĭue to interruption (for example disrupted internet connection) during download, a damaged Install macOS Sierra.app will be given stopping installation. After that, go back to Mac App Store to get final version of macOS Sierra.
Remove existing "Install macOS Sierra" files from Mac or connected hard drive because they are probably one of the beta or GM builds not full version. If you are unable to download macOS Sierra and find it is shown "Downloaded" in the Mac App Stores, you are suggested to do like this: