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Model: iMac11,2 (Core i3-550, MC509LL/A)

It was shipped with Snow Leopard 10.6.4, and I managed to update to 10.6.8 via Apple Software Update. After some research I found that this old iMac is capable of running Sierra (10.12.x) and made a few attempts to upgrade.

I noticed that I must first upgrade it to Lion (10.7.5) or El Capitan (10.11.6), both of which are no longer available from the Mac App Store.

But, all info I found from Google tells me to upgrade via MAS. (That's why I'm adding a month in the title.) Any ideas?

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  • You can try going into an Apple Store where they can download it for you. Barring that, you can have a friend make a USB installer for you if they have El Cap or Sierra already installed.
    – Allan
    Jun 10, 2017 at 2:38
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    Try this link to download El Capitan: itunes.apple.com/us/app/os-x-el-capitan/id1147835434?mt=12
    – Allan
    Jun 10, 2017 at 2:44

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You have a couple of options you can try:

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