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Question: cannot update 2013 iMac to High Sierra

I have tried multiple times to update from 10.9.5 to High Sierra. This is what shows on the log after about 20 hours of updating - or at least a show of very gradual movement on the blue bar:


User uploaded file

I think this is the applicable bit. What does "Target is not convertible to APFS: This volume is not formatted as Mac OS Extended (Journaled)."

Thank you.

iMac, OS X Mavericks (10.9.5)

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User profile for user: kathieh

Question: cannot update 2013 iMac to High Sierra