1

I got this message on a MacBook Pro 2012:

path /system/installation/packages/osinstall.mpkg appears to be missing or damaged

The first thing to do is to safe data. The hard disk is encrypted with FileVault.

Is it possible to plug it to another MacBook Pro (running High Sierra or El Capitan) and pull the data?

2

Yes,

Boot the Mac you want the data from into target disk mode, https://support.apple.com/en-us/HT201462. Connect the two Macs and wait. You should be prompted for the file vault password. After you enter the correct file vault password wait some more. After a few minutes the other mac's drive should mount on the desktop. Now copy over any files you want to keep.

  • Thank you, I will try on tomorrow and I will say if it's ok or not. – beegees Dec 4 '17 at 18:58
  • OK, it was like you said, I had to put the password of the disk. Unfortunately it was impossible for me to get data, but what you said was correct. Thanks. – beegees Dec 5 '17 at 17:59

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