I keep getting "Installation of macOS cannot continue. ...download important data etc." warning

I keep getting "Installation of macOS cannot continue. ...download important data etc." warning while trying to install Sequoia on an external SSD. The SSD has been properly formatted. The only other issue is that the iMac's fusion drive became somehow compromised a couple years ago so it has been used as a back up for simple tasks. It's the only thing I can think of that might be causing this, but I am no expert. I was hoping that the SSD install and reassigning the startup disc accordingly would make the machine more useful/reliable. I just can't get the install to happen. Any help anyone can offer would be greatly appreciated.

Thank you in advance.

iMac 27″, macOS 12.6

Posted on Mar 14, 2025 10:11 AM

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Owl-53

Level 10

102,277 points

Posted on Mar 15, 2025 3:53 AM

Predicated on this computer Qualifies to run macOS 15 Sequoia

The below link should answer this question very quickly.

macOS Sequoia compatible Computers

If Yes you may consider this User Tip from fellow contributor @ Jack- 19

link >> Use an external SSD as your startup disk … - Apple Community

During the Installation process

" The installer needs a stable internet connection to get firmware and other information specific to your Mac. Make sure that your Mac is connected to the internet. "

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16 replies

Mar 28, 2025 2:14 AM in response to edsass

Hello again, Eric! 😄

Have you had the opportunity to try the procedure again? (It doesn't take long!)

Please advise.

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I keep getting "Installation of macOS cannot continue. ...download important data etc." warning