![]() I'm actually trying to help a neighbour with this problem, so it will be a couple of days before I can get to her home to try your instructions. You do not need to reset the date and time using this method. In order to do that you may have to seek out a copy of the old Lion DiskMaker or DiskMaker 3, ![]() If you manage to redeem the Lion installer then you will need to create a bootable USB so you can transfer it Get a very long Ethernet cable or move the mac closer to her router, as said before WiFi has a habit of How to create a bootable installer for macOS – Apple Support ![]() In the Applications folder and the createinstallmedia command in the Terminal app. Now you are ready to create a bootable USB installer disk using the Install OS X El Capitan.app You want to eventually install El Capitan on, that is for later.) The disk that you are booted to at the time. (If the installation window asks which disk you want to install to, you must pick You will find in your Applications folder, it should be 6.2GBs in size. That and an installation window will open, this does not install El Capitanīut converts the InstallMacOSX.pkg to the Install OS X El Capitan.app which When downloaded open to InstallMacOSX.pkg, double-click on The next section can only be done on a mac that is capable of running El Capitan,Ī mac that came preinstalled with an OS later than El Capitan will refuse to do the next bit. This downloads InstallMacOSX.dmg to your Downloads folder. Go to Section 4 and click on Download OS X El Capitan. How to upgrade to OS X El Capitan – Apple Support (you do not need to reset the date and time for this method) You can download El Capitan with the new certificate from here, Yes El Capitan can be installed on that iMac, you used a USB you already had, but if this had beenĬreated before October 2019, it would fail because the certificate for it has expired, that is mentioned There could be dozens of reasons why it may not work.
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