yoi009
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Q: i have downloaded OS X Yosemite using recovery from boot but while installing error occuring showing unable to extract essential.pkg so can't install. problem is i have already formatted my drive and dont have any os right now. please help

i have downloaded OS X Yosemite using recovery from boot but while installing error occuring showing unable to extract essential.pkg so can't install. problem is i have already formatted my drive and dont have any os right now. only the downloaded new os x yosemite in the os x base system. please help

MacBook Pro, OS X Yosemite (10.10)

Posted on Dec 31, 2014 6:06 PM

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yoi009

Q: i have downloaded OS X Yosemite using recovery from boot but while installing error occuring showing unable to extract essential.p ... more

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  • by Linc Davis,

    Linc Davis Linc Davis Dec 31, 2014 9:07 PM in response to yoi009
    Level 10 (208,037 points)
    Applications
    Dec 31, 2014 9:07 PM in response to yoi009

    Please try again after taking each of the following steps that you haven't already taken.

    Step 1

    Reset your computer’s PRAM.

    Step 2

    If your model has user-replaceable memory, and you've upgraded the memory modules, reinstall the original memory and see whether there's any improvement. Be careful not to touch the gold contacts. Clean them with a mild solvent such as rubbing alcohol. Aftermarket memory must exactly match the technical specifications of the machine.

    Step 3

    Back up all data to at least two different storage devices, if you haven't already done so. One backup is not enough to be safe. The backups can be made with Time Machine or with Disk Utility. Preferably both.

    Erase and install OS X. This operation will destroy all data on the startup volume, so you had be better be sure of the backups.

    Step 4

    Make a "Genius" appointment at an Apple Store, or go to another authorized service provider to have the machine tested.

  • by yoi009,

    yoi009 yoi009 Jan 2, 2015 4:34 AM in response to yoi009
    Level 1 (0 points)
    Jan 2, 2015 4:34 AM in response to yoi009

    thanks for the reply.....

    i had never replace my RAM..... but windows 8 in bootcamp partition is still there... can it be the reason for the error.

  • by rikardpahlen,

    rikardpahlen rikardpahlen Apr 12, 2015 8:10 PM in response to yoi009
    Level 1 (0 points)
    Apr 12, 2015 8:10 PM in response to yoi009

    An error occurred was not able to extract essential.pkg


    I found a way to get this back on track, took me lots of time trial and error, my computer got so bad in the end it could not boot up even in safe made (left **** key during boot up.

    Then when I in the only mode it was starting up by now (in CMD + R key start up mode) tried to install it was not recognized by Apple any more so they wouldn't let me DL the system again (I have DL it 7 or 8 times by now, luckily Im on a 120 GB plan)

    Was starting to panic quite badly by then...

    But have no fears friend, there is a remedy for this!!!

    Start up in Internet Recovery Mode, Opt + CMD + R key during start up, it takes a while but then a globe starts spinning on the screen and goes on and on and on so please be patient.

    Then it reeboots itself and you get back to a screen looking identical to the CMD + R start up, after that it just sorted itself out, instal was a piece of **** and Yosemite 10.10.3 running sweet

     

    Hope this helps for those with this problem, cheers