Download Mountain Lion from the Mac App Store (Note: the default install deletes the installer image after installation, so you will need to re-download it from Mac App Store/Purchases if you already deleted it.)Ģ. Lion Diskmaker has been updated to allow you to make a bootable USB or SD Card installer on a 8GB piece of media.ġ. That does not mean you cannot sneaker net the install around your home, office or lab like Apple Store employees do (sometimes). It was a terminal command but it keeps popping an error.Apple will not offer a USB or Optical Disk external installer to Mountain Lion (as far as we have heard). I found a thread that said a I need to back the date/time of the machine back up to a date before Apple stopped signing old versions of MacOS in 2019. I get the weird negative 2 billion hours to download and then the error shown in the last picture. I am going to attach some pictures but it will only let me attempt to download Lion which is what I can only assume is what this machine came with. Meanwhile the Mac I am trying to install on is stuck in internet recovery mode. dmg version of High Sierra but I can’t find a way to create a bootable USB out of it. I have gone to Download macOS High Sierra 10.13.2 and it will let me download. I have also tried to download High Sierra as an app but the Mac App store will not let me do that since this M1 Mac was made with a more recent version. I attempted to use diskmakerX but I need to use my M1 Mac to create the boot installer on the USB drive but no versions of diskmakerX work. Just so everyone knows where I am at with the old mac. I am trying to download the installer that sent me. I was away at a kid’s soccer game for a bit. # Thanks to Tim Sutton for ideas, suggestions, and sample code. # See the License for the specific language governing permissions and # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # distributed under the License is distributed on an "AS IS" BASIS, # Unless required by applicable law or agreed to in writing, software # You may obtain a copy of the License at # you may not use this file except in compliance with the License. # Licensed under the Apache License, Version 2.0 (the "License") grahampugh/macadmin-scripts/blob/main/installinstallmacos.py #!/usr/bin/python It requires some comfort with the Terminal, but it is used by lots of Mac admins. US/EasternĪnother option is to use installinstallmacos.py to download the installer DMG that you want. However, in this case, I may be able to offer some private counsel on another - I’ll send you a DM. The normal recommended route for this would be to get an older version of the OS, create a VM (VMWare Fusion is now free for personal use), and then get the installer inside the VM, then export it, then create the disk from the app you have exported to VM. However, you may run into a “chicken and the egg” problem where you can’t get the installer app for High Sierra without a computer that can use High Sierra. If that is the case, I would definitely try High Sierra. I know you said you’ve tried that, but I might give it another go. According to Mactracker, the 2011 MBPs support up through High Sierra.
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