Of the many files and folders that make up macOS Sierra, there’s probably none so important to maintaining the “personality” of your Mac than the ~/Library folder. Inside this folder are many subfolders that contain preference lists (“plists”), database files storing a variety of important information, and many other files that maintain the state of macOS and of the individual apps that run on a Mac. Thanks to the importance of this folder, it’s normally hidden from view. Today we’ll show you a few ways to view the ~/Library folder.

New technologies at the heart of the system make your Mac more reliable, capable, and responsive — and lay the foundation for future innovations. MacOS High Sierra also refines the features and apps you use every day. It’s macOS at its highest level yet. Easily organize, edit and view your photos in Photos.

Warning: Don’t play with the ~/Library folder if you don’t need to!
Before we go any further, it’s time for a warning. Don’t throw away or change anything in the ~/Library folder unless you know what you’re doing. Deleting individual files or folders found within ~/Library can cause individual applications or the operating system to malfunction.

When would you want to poke around in ~/Library? Perhaps you’re gaining knowledge about macOS as a developer and want to know how the operating system stores information. Maybe you want to clean out the remnants of an app that you haven’t had on your Mac for several years. In any case, it’s best to remember what your parents told you when you were a kid and were in a place filled with expensive and breakable things — “Look, but don’t touch!”

Method One: Our Friend, the Option Key
The first and easiest way is to use a trick that gives many of the items in the macOS menu bar “super powers” — hold down the Option key while clicking on a menu. In this case, Option-clicking the Go menu in the Finder adds a new menu item — Library — that opens the ~/Library folder (see image below):

As you can see from the image above, holding down the Option key while clicking on the Go menu in the Finder adds one item as seen on the right — the Library folder. Select that menu item and a window similar to the one seen below opens on the Mac screen:

Of these folders, Application Support is quite critical as it holds information for the current user’s apps. You’ll see many “.plist” files; these are XML (Extensible Markup Language) files that can be viewed on the Mac by simply highlighting the file and pressing the space bar to bring up a Quick Look. There are also a number of log files (text-based), temporary files, app plugins, and database files (.db or .sqlite) that are critical to storing settings and data in your favorite apps.

Method Two: Command-Shift-Period
The second method works from any open Finder window, and it uses the keyboard shortcut Command-Shift-. (that dot indicates the period key). This is a fun command, as it makes any hidden files or folders visible in the Finder. On the left in the image below you see my Home folder. Pressing Command-Shift-. makes hidden folders and files appear as shaded icons, shown on the right:

Pressing Command-Shift-Period makes hidden files and folders visible (right image)

See that Library folder in the center of the list on the right? Even though it is shaded, it can be double-clicked to open and view everything that’s in the folder. What’s more, some of the files that are not visible in the ~/Library folder when using Method One appear when using Method 2.

One other thing to note: Command-Shift-. makes these files and folders visible until the next time you use the command or reboot the Mac. If you’re poking around in the ~/Library folder on a Mac that other people may use without having their own logins, be sure to press Command-Shift-. one more time to set things back to hidden once you’re done. Note that Command-Shift-. also makes Library visible in the Finder Go menu without having to press the Option key…

Just remember, anything you change or delete in the ~/Library folder can affect how your Mac or individual applications work, so use these methods to just view hidden files or folders. Don’t delete the files or folders in ~/Library unless you know what you’re doing.

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

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.

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

Realzoom quartz for mac free. 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.