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I have two machines 1 iMac 2009 24” and one MacBook Pro 2017 touchbar. The iMac I cannot open at all as I erased everything from the Macintosh HD. I am trying to fix by using Catalina on the MacBook Pro to create a bootable USB to boot the iMac from.

The 2009 iMac had two partitions in its Harddrive, one for HD Mactintosh and one for BootCamp. I wanted to wipe everything so I shutdown the machine then started it while hitting CMD + R then I get the restore window and I choose restore Mac OS then it asks me to sign it to my apple store and I enter my App Store details but it gives this error This item is temporarily unavailable I wonder how I can get the macOS restored if anyone could please help as I am kinda stuck and don't know how to solve this.

I have downloaded the El Capitan .dmg file and erased a 32GB USB stick to macOS journaled but I don’t know how I can make it bootable from the dmg file? And then how I can use the bootable USB to install the macOS?

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David Anderson
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Tak
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    Do you actually mean the original OS X? I ask because early 2009 iMacs originally had OS X 10.5.6 installed and late 2009 iMacs originally had OS X 10.6.2 installed. Or, do you want El Capitan OS X 10.11 as shown in your question? – David Anderson Apr 15 '20 at 18:20
  • Does this answer your question? How can I download an older version of OS X/macOS? Note: I tried the link to download El Capitan and am currently able to download the InstallMacOSX.dmg file. – David Anderson Apr 15 '20 at 18:30
  • @DavidAnderson I want to download any version which then I can update it to the latest. I already downloaded the El Capitan OS X but I don’t know how to make it bootable and how to boot from it on my iMac? – Tak Apr 15 '20 at 19:01
  • You should update your question to indicate what you are currently asking. – David Anderson Apr 15 '20 at 19:06
  • @DavidAnderson I’ve updated my question as requested. I hope you could help me. – Tak Apr 15 '20 at 19:11
  • Sorry, I did not mean for this to be closed. I know you edited the question, but you should have removed the part where you indicate you are having problems downloading. This made you question appear to be a duplicate. While it is still a duplicate, it is not a duplicate of the question in the link. – David Anderson Apr 15 '20 at 21:00
  • @DavidAnderson so what shall I do? :/ – Tak Apr 15 '20 at 21:02
  • I posted an answer here. – David Anderson Apr 15 '20 at 23:10
  • @DavidAnderson Could you check my question here please? https://apple.stackexchange.com/questions/390063/restore-from-timemachine-after-merging-all-partitions – Tak May 01 '20 at 21:24

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