Help with Sierra Photo app

Discussion in 'macOS Sierra (10.12)' started by Martyimac, Feb 15, 2018.

  1. Martyimac macrumors 68000


    Aug 19, 2009
    S. AZ.
    I downgraded my main desktop to Sierra from High Sierra. I copied the photos library to my other mac for backup.
    My problem is the Photo app on Sierra says it can't open the library from High Sierra.
    Anybody have any tips on what I can do here?
  2. casperes1996 macrumors 68040


    Jan 26, 2014
    Horsens, Denmark
    You have three options. A) Revert the library to a backup.
    2) Manually dig open the library and extract all the photos and create a new library. This maintains the photos but loses albums and whatnot.
    III) Go back to High Sierra
  3. Fishrrman macrumors P6


    Feb 20, 2009
    The OP's problems illustrate why -- before a major upgrade from one version of the OS to the next -- it's IMPERATIVE to create a fully-bootable cloned version of your "older install" using either CarbonCopyCloner or SuperDuper.

    IF the OP had such a backup, it would be "child's play" to "get back to where he once belonged".

    But -- WITHOUT a cloned backup -- getting back ain't gonna be easy.

    What you might try -- this is going to be A LOT OF WORK.
    You'll need an EXTERNAL drive. You CANNOT DO THIS on Low Sierra.
    Install a copy of High Sierra onto the external drive. Yes, it's going to take time.
    Put the Photos Library (the one that won't open) into your "home/pictures" folder on the external drive, REPLACING whatever is installed onto it.
    Now... you ought to be able to reopen the library (since HS is running).
    Next, select ALL photos and choose to export them to a folder (I have no idea how many pics you have in there). You'll probably need another drive or USB flash drive.

    Now, boot back to Low Sierra.
    On your Low Sierra (internal) drive, open home/pictures.
    RIGHT CLICK on the Photos library and choose "show package contents"
    It will open and show you the contents of the Photos Library.
    See the folder named "Masters"? Open it.
    Now type "command-a" (select all) and select everything inside the Masters folder.
    Move this to the trash, and empty it.

    With the previous contents removed, now open Photos.
    Choose to import the folder with the previously-exported pics from the HS install.
    Does Photos import them?

    Again -- this sounds like a lot of work, because it is.
    You'll have to go through this, because you DIDN'T take the important step I described in the first paragraph above BEFORE you upgraded from Low Sierra to High Sierra...
  4. Martyimac thread starter macrumors 68000


    Aug 19, 2009
    S. AZ.
    The only point I think you missed was that I had the photo library on a separate mac so didn't have to install HS on a separate external drive. Everything else looks like it should work.
  5. Jack Neill macrumors 6502

    Jack Neill

    Sep 13, 2015
    San Antonio Texas
    Recopy the library from the other Mac again if that Mac has 12.6 or less.

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4 February 15, 2018