Installer is an application included in macOS (and in its progenitors OPENSTEP and NeXTSTEP) that extracts and installs files out of.pkg packages.It was created by NeXT, and is now maintained by Apple Inc. Its purpose is to help software developers create uniform software installers. Installer launches when a package or metapackage file is opened. The Mac might have been stuck on 20 minutes remaining for the past two hours, but this doesn't necessarily mean it's not busy trying to install the software. Look at the Log to see if your Mac.

Installer is an application included in macOS (and in its progenitors OPENSTEP and NeXTSTEP) that extracts and installs files out of .pkg packages. It was created by NeXT, and is now maintained by Apple Inc. Its purpose is to help software developers create uniform software installers.

Installer launches when a package or metapackage file is opened. The installation process itself can vary substantially, as Installer allows developers to customize the information the user is presented with. For example, it can be made to display a custom welcome message, software license and readme. Installer also handles authentication, checks that packages are valid before installing them, and allows developers to run custom scripts at several points during the installation process.^[1]

Installer package[edit]

Installer packages have the file extension .pkg. Prior to Mac OS X Leopard, installer packages were implemented as Mac OS X packages.^[2] These packages were a collection of files that resided in folders with a .pkg file extension.^[3][4] In Mac OS X Leopard the software packaging method was changed to use the XAR (eXtensible ARchiver) file format; the directory tree containing the files is packaged as an xar archive file with a .pkg extension.^[5] Instead of distributing multiple files for a package, this allowed all of the software files to be contained in a single file for easier distribution with the benefit of package signing.

See also[edit]

References[edit]

1. ^'Software Delivery Guide - Specifying Install Operations'. Apple. Retrieved October 11, 2016.
2. ^'Software Delivery Guide'. Apple. Retrieved March 15, 2015.
3. ^'The Flat Package'. MacTech. Retrieved March 15, 2015.
4. ^'OSX legacy packaging redux'. Matthew Brett. Retrieved March 15, 2015.
5. ^'XAR NEW MacOS X 10.5 package format'. MacGeekBlog. Retrieved March 15, 2015.

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

Just calling it a MacBook Pro isn’t enough; for example, I’ve got MacBook Pro (Retina, 15-inch, Mid 2015). Hard drive for apple laptop. To find out what you have, click the Apple logo in the top left corner of the menu bar and select the “About This Mac” option.On the Overview tab you’ll see your Mac’s exact model.This will help you figure out if you can upgrade the hard drive in your Mac, and help you find the right parts. Finding Your Mac’s ModelBefore doing anything you need to be sure exactly what model Mac you have.

Download macOS

Find the appropriate download link in the upgrade instructions for each macOS version:

macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.

OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

1. Connect the USB flash drive or other volume that you're using for the bootable installer. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
2. Open Terminal, which is in the Utilities folder of your Applications folder.
3. Type or paste one of the following commands in Terminal. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.
   Catalina:*
   Mojave:*
   
   High Sierra:*
   El Capitan:
   
4. Press Return after typing the command.
5. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
7. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument, similar to the way this argument is used in the command for El Capitan.

Use the bootable installer

After creating the bootable installer, follow these steps to use it:

1. Plug the bootable installer into a compatible Mac.
2. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
   Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
3. Choose your language, if prompted.
4. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
5. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

Samsung Printer Software Installer For Mac

For more information about the createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:

Catalina:

Mojave:

Mac Software Downloads

High Sierra:

Installer Software Macbook

El Capitan: