MacOS – Problem while updating to macOS High Sierra (Target is not convertible to AFPS)

apfsencryptionhigh sierramacos

I started my update at night and woke up in the morning to this screen, stuck at the same place for hours now.

enter image description here

The error log is a long sequence of the same two lines.

isConvertableToAPFS: was called on a APFS disk.
Target is not convertible to APFS: This volume is not formatted as Mac OS Extended (Journaled).

Here is a screenshot.

enter image description here

So after browsing around the internet for a bit, I figured there are some solutions I could try.

  1. Reboot into internet recovery. From here.
  2. Disable encryption. Since in Disk Utility, my drive is shown as Mac OS Extended (Journaled, Encrypted) and not what you see in the error log.
  3. And of course, retry.

But the problem is that I can't afford to lose the data I have downloaded till now, i.e., I can't download 5GB of data all over again.

All the options I see till now, involve closing the the installer. So I have two questions: Will I lose my data if I close the installer? If yes, is there any other to go about it, a fourth option?

My primary aim is not losing data, I plan on keeping the installer running till I don't find a solution.

Best Answer

The installer will still be in your Applications folder. Cancelling should also be fine as the installer automatically backs up your data.

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