You don’t need to use the second script if your choice is macOS Big Sur. The script will build the offline installer and save it to the same folder. All you need is to drag and drop the downloaded macOS folder to the terminal window. For macOS versions up-to Big Sur, you need to use another script “ mand” in the main folder to join all the downloads and make the full macOS installer app. The OS gets downloaded as parts, PKGs, DMGs and other files. A new folder “macOS downloads” appears in the “ gibMacOS-master” as you provide a download option, and the OS starts downloading as you can see in the video. You can use this script to download macOS Ventura 13, Monterey 12, 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. Customers get Software upgrades for Mac computers through the online app store ever since the release of macOS Lion.

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