Cannot update and install latest macOS Sierra 10.12.1 in your Mac computer? Don't worry. Here in this article, we'll offer you effective methods to assist you fixing complex macOS Sierra update error such as fail to download or update stuck issue in Mac. You can simply follow below offered steps and solutions to fix this issue with ease now.

Yesterday I update MacOS Sierra to MacOS High Sierra than I remove xCode 9.2 after that when I try to install xCode 9.3 from App Store, It gives me below error: Xcode failed to download, Use the purchase page to try again I tried below solutions. 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. I am not able to download the Xcode from new MacBook Air. Here is the configurations MacOS High Sierra Version 10.13.4 Xcode version to download - 9.3. App Store not downloading macOS Sierra I just renewed my Membership on Apples Dev Site, and now I'm trying to update to macOS Sierra - went to the Dev Download Site, redeemed my Download Code via the Download Button and started to download the Update, but had to disconnect my Internet-Cable.

Now let's follow to update and install macOS Sierra 10.12.1 in Mac computer without any obstacles or losing any data now.

Step 1. Backup important Mac data in advance

In order to avoid unexpected data loss error or problems while installing new macOS Sierra in Mac, it's highly necessary to create data backups in advance.

You may directly apply Time Machine as a free tool to full backup your important Mac data with simple clicks.
If you don't have a backups and lost some data while installing new macOS Sierra update, you can try professional Mac data recovery software to get all lost data back.

Step 2. Fix macOS Sierra fail to download or 'An error has occurred' issue

If your Mac shows a error message that 'An error has occurred' or 'Failed to Download' while you are trying to downloading a new update for macOS Sierra. And this has become a common issue that many users have to face while upgrading Mac to a new operating system. And you may follow below tips to fix this issue:

• Open Launchpad > Delete 'Install macOS Sierra' file with a question mark on it;

Reboot Mac and retry to download a new macOS Sierra update 10.12.1:

• Click Apple Menu > Select App Store > Click Update next to macOS Sierra in the Update section.

Then the new update of macOS Sierra 10.12.1 will be downloaded automatically for you. Then you can try to install the latest macOS update in Mac computer now. If you get stuck or frozen while installing macOS Sierra 10.12.1, you can jump to Step 3 to find solution.

Step 3. Solve macOS Sierra update stuck issue or install freeze error

If your Mac computer gets stuck or freezes up while installing macOS Sierra 10.12.1, don't worry. You may try below tips to fix this issue with ease now:

• Disable or uninstall any Anti-virus software on your Mac;
• Ensure Mac computer has a proper and reliable internet connection;
• Install macOS Sierra in Safe Mode:

Hold Power till Mac shuts down > Turn Mac on and hold Shift key > Release Shift when Apple logo appears > Then Mac shall be booted into the Safe Mode.

Step 4. Download and install macOS Sierra 10.12.1 update

Now you can continue to download and install macOS Sierra 10.12.1 in Mac.
How? You can try to get a update in Mac by the follow clicks:

Click Apple Menu > Select App Store > Click Update next to macOS Sierra in the Update section.

Or you can directly download it by click below link:
Download macOS Sierra 10.12.1 Update

Then you can run macOS Sierra 10.12.1 update and follow the on-screen instruction to install the new update in Mac computer with ease now.
And don't worry about losing any data if you have created backups in Step 1. If you don't have any backups and lose data while installing macOS Sierra 10.12.1, don't worry. Next we'll offer you effective tip to restore lost data due to macOS Sierra 10.12.1 update.

Tip: Restore lost data after macOS Sierra 10.12.1 update

Here we'd like to recommend you try professional Mac data recovery software - EaseUS Data Recovery Wizard for Mac which fully supports all macOS systems including the newest macOS Sierra 10.12.1, El Capitan, Yosemite etc. It allows you to restore all lost data due to macOS update or other reasons within 3 steps.

Just apply this software and follow this tutorial to restore files on Mac now.

Check compatibility

You can upgrade to macOS Sierra from OS X Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 8.8GB of available storage space.

MacBook introduced in late 2009 or later
MacBook Air introduced in late 2010 or later
MacBook Pro introduced in mid 2010 or later
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.

Make a backup

Before installing any upgrade, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Learn how to back up your Mac.

Get connected

It takes time to download and install macOS, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power.

Download macOS Sierra

Macos Sierra Failed To Download Use The Purchases Page

For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of the Mac operating system.

If you still need macOS Sierra, use this link: Download macOS Sierra. A file named InstallOS.dmg will download to your Mac.

Install the macOS installer

Double-click the downloaded file to open a window showing its contents. Then double-click the file within, named InstallOS.pkg.

Macos Sierra Failed To Download Use The Purchases Without

Follow the onscreen instructions, which will guide you through the steps necessary to install.

Begin installation

After installation of the installer is complete, open the Applications folder on your Mac, then double-click the file named Install macOS Sierra.

Click Continue and follow the onscreen instructions. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

Allow installation to complete

Please allow installation to complete without putting your Mac to sleep or closing its lid. Your Mac might restart, show a progress bar, or show a blank screen several times as it installs both macOS and related updates to your Mac firmware.

Learn more

• If you have hardware or software that isn't compatible with macOS Sierra, you might be able to install the previous version, OS X El Capitan.
• macOS Sierra won't install on top of a later version of macOS, but you can erase your disk first or install on another disk.
• You can use macOS Recovery to reinstall macOS.