You can use this script to download macOS Big Sur (11.1), Catalina (10.15), Mojave (10.14), and High Sierra (10.13.6). When the list is ready choose a number as per your OS option and press the Return/Enter key. Wait for the script to fetch the macOS download catalogue from Apple. From the extracted folder, run the script called mand - it will open the Terminal as shown below.
Hence, before anything, we will tell you how to download macOS offline installer directly from Apple to your Mac using a GitHub script.ĭownload the gibMacOS script from this link and extract it to your Mac. And you need to download a full-size macOS installer for making this disk. Installing macOS without internet requires a bootable USB disk. Having a macOS offline installer or a bootable USB disk is the only solution in such scenarios. But there are situations where you can’t download the OS from the Apple servers. Apple also provides an option for internet recovery of macOS if your computer fails to boot.
The online OS update is OK if you have stable broadband connectivity and enough bandwidth.
Be it a clean install or upgrade, Mac App store require you connect to the internet to download whole installation files.
Select it and follow the prompts to install OS X Yosemite.Customers get Software upgrades for Mac computers through the online app store ever since the release of macOS Lion. Reboot the Mac holding the Alt/Option key on the keyboard and you’ll see the installer appear in the EFI boot menu.
When it’s complete, your USB installer will be mounted to your Desktop and you can now rename this drive (highlight it on the Desktop and press Return), as well as supply it with its own custom icon.Įject your new Yosemite USB installer and connect it to any Mac you wish to upgrade to the Yosemite Public Beta. Let the tool do it’s thing and don’t interrupt the process until you see Terminal output Done and return your window to the user prompt. This will create a bootable Yosemite USB installer using OS X’s createinstallmedia tool, which can take quite a while depending on the speed of your flash drive. Press the Return key on your keyboard to execute the command, and enter your admin password when requested. Sudo /Applications/Install OS X Yosemite Beta.app/Contents/Resources/createinstallmedia – volume /Volumes/Untitled – applicationpath /Applications/Install OS X Yosemite Beta.app – nointeraction Open Terminal from /Applications/Utilities and then enter the following command: Now that your USB flash drive is ready, we can complete the process of creating a bootable Yosemite USB installer with a simple Terminal command. Step 3: Create the Bootable Yosemite USB Installer with Terminal Note that this will erase all contents of the USB drive so, as mentioned above, be sure to back up any files on the drive or use a blank drive to begin with. Press Apply to restructure the USB volume with the new parameters. Under Partition Information, change Format to Mac OS Extended (Journaled) and give the drive the name “Untitled” (this allows your drive to work with the Terminal commands below you can rename the drive when the process is complete). Then click Options, choose GUID Partition Table, and click OK to save the change. In the drop-down menu under Partition Layout, choose 1 to create a single new partition. This won’t work for Yosemite, so we need to change it. In our case, our drive is brand new and formatted as a FAT volume with a Master Boot Record partition scheme. The partition scheme and volume properties of your flash drive will vary depending on manufacturer and previous configuration. With the USB drive selected, choose the Partition tab on the right side of the window. Note that you want to select the drive and not the volume. We’re using a SanDisk Cruzer flash drive, so in our case we choose 8 GB SanDisk Cruzer Media and not the default “No Name” volume. In Disk Utility, select the USB flash drive from the list on the left. Plug the drive into a Mac running OS X 10.7 Lion or higher and launch Disk Utility from the /Applications/Utilities folder. While it’s possible to create a separate partition for the Yosemite USB installer, it’s safest and easiest to use an empty drive or one that you don’t mind erasing. Grab a USB flash drive that’s at least 8GB in size. It will also launch the Yosemite installer app when the download completes.
This will put a file called Install OS X Yosemite Beta.app in your /Applications folder. If you’re registered for the Yosemite beta program, download the OS X Yosemite Public Beta installer from the Mac App Store.
Step 1: Obtain the Yosemite Public Beta Installer