Get macOS Big Sur from Apple CDN

TLDR: Open Terminal and run this command

curl http://17.253.55.201/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H "Host: swcdn.apple.com" -o InstallAssistant.pkg

After downloading, you can locate the downloaded file by this command

open .


You will see InstallAssistant.pkg file, just run it to begin the installation.

I’ve downloaded, it’s 12182587199 bytes, MD5 hash 0030d26c6e5d01b7aa10a91b044d6ca7

After installing the downloaded package file, you can open System Preferences > Software Update and click Upgrade Now

To make the USB Installer, you can find the Install macOS Big Sur.app inside /Applications. Or use https://mothersruin.com/software/SuspiciousPackage/get.html to extract the files from InstallAssistant.pkg

Basically the Software Update wants to download InstallAssistant.pkg from Apple CDN, but probably their CDN network has problems. So I’ve tried all the Apple CDN IPs and get one server working – 17.253.55.201

All CDN IPs are:

– 17.253.55.209
– 17.253.57.202
– 17.253.57.205
– 17.253.55.201
– 17.253.57.203
– 17.253.57.207
– 17.253.55.205
– 17.253.57.201
– 17.253.57.209
– 17.253.55.202

6 Replies to “Get macOS Big Sur from Apple CDN”

  1. It was coming down too slow for me, so… and sorry
    my brain is too fried to make this proper script. 12 tabs, 12 copy pastes and finally when all done, run the cat command at the end:

    curl –range 0-999999999 -o ia.part1 http://17.253.55.209/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 1000000000-1999999999 -o ia.part2 http://17.253.55.201/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 2000000000-2999999999 -o ia.part3 http://17.253.57.202/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 3000000000-3999999999 -o ia.part4 http://17.253.57.205/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 4000000000-4999999999 -o ia.part5 http://17.253.57.203/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 5000000000-5999999999 -o ia.part6 http://17.253.57.207/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 6000000000-6999999999 -o ia.part7 http://17.253.55.205/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 7000000000-7999999999 -o ia.part8 http://17.253.57.201/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 8000000000-8999999999 -o ia.part9 http://17.253.57.209/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 9000000000-9999999999 -o ia.part10 http://17.253.55.202/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 10000000000-10999999999 -o ia.part11 http://17.253.55.209/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    curl –range 11000000000- -o ia.part12 http://17.253.55.201/content/downloads/50/49/001-79699-A_93OMDU5KFG/dkjnjkq9eax1n2wpf8rik5agns2z43ikqu/InstallAssistant.pkg -H “Host: swcdn.apple.com”

    cat ia.part? > InstallAssistant.pkg

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