![]() ![]() I have fallen at the first hurdle as using Disk Utility from restart and Option R fails as the disk will not unmount. Now I am following the advice to erase the disk on the old machine so if someone wanted it, it would be out-of-the-box for them. On a 2009 iMac anyway, you need to download the correct one for El Capitan.)Ĭannot make a bootable USB drive for El Capitan I have upgraded my 2009 iMac to a lovely Late 2015 5K Retina machine and I have struggled my way through the migration from the old to the new. (Incidentally your post says InstallOS.dmg, this contains the installer for macOS Sierra 10.12.6 which cannot be installed Unless you have another mac that you know can run El Capitan you may want to try this workaround. The mac you tried with previously more than likely came preinstalled with an OS newer than El Capitan and that is Requires you to be using a mac that is capable of running El Capitan. To the Install OS X El Capitan.app that you need if you want to install El Capitan and create a bootable USB installer If resetting the date does not work then you may have to revisit downloading the InstallMACOSX.dmg.Īnother brilliant piece of Apple software engineering that in order to develop the. If this works then when the OS is installed and booted up you can Open System Preferences> Date & Time Once the date has changed you can quit Terminal. You won't be prompted for a Password if you did not need to use sudo If Terminal returns an error saying sudo : command not found, then try again without sudo. Make sure WiFi is switched off, it can reset the date back to today.Įnter a new date, for example or just copy and paste We are going to set the time and date on your mac to a date previous to the expiry date of the certificates.Ĭonnect your mac to your router via cable, not WiFiīoot to your Recovery HD, click on Utilities in the menubar select Terminal. If you try to reinstall El Capitan from Apples Recovery Servers you may encounter the issue that Apple still have not updated the certificates of the OS's on their servers, they expired on October 2019, so Apple have been extremely tardy not to address this. Thank you very much for taking the time to read this! Any ideas for me to get El Capitan on the old iMac again? app, which I need to put on the USB drive, I get the message: 'This version of OS X 10.11 cannot be installed on this Computer'.Īt this point I'm stuck. I downloaded the InstallOS.pkg on my MacBookAir (M1, 2020).I had a feeling this might not be temporary, so I decided to make a bootable USB drive instead.Upon which I get the message: 'This item is temporarily unavailable. ![]() ![]()
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