![]() ![]() From there test booting from the SSD (hold down the option key when powering up) and then try running your Adobe software. If all is good, you can then follow the instructions I shared to copy your system to a bootable SSD. Once you're able to downgrade to EC and restore your system from your time machine backup, you can try upgrading to High Sierra (or not) through the Software Update in System Preferences. Came from here: (scroll down for Sierra, High Sierra, etc). It will restore your user account(s), any third party software you had installed, and all other personal data.ĭowngrading to El Capitan should work using the same steps Here's the install file for El Capitan. The OS will ask if you have data to restore. Quit Disk Utility when it's done and then choose the option to install macOS.Īs the OS install nears completion, have the drive with your Time Machine backup on. Use Disk Utility (from the top menu bar) to erase the internal drive. Once booted to the USB drive, you'll see a minimal work screen. This will take longer than starting up from the Mac's main drive. A screen will appear with drives you can startup to. Restart the Mac and immediately hold down the Option key. Though edited next to include more detail.īoot to the USB drive with the older OS you want to install. ![]() You'll know it's done when Terminal goes back to a new prompt that looks the same as the first one.įrom here, we assume you have a current Time Machine backup and you've turned that drive off. When it's done, the USB drive's name will change to Install macOS Mojave. The USB drive will be erased and Mojave will be installed to it. ![]() You'll then be asked if you really want to erase the volume named a. Now copy/paste the modified line that ends in a into Terminal and press enter. Change the name of the drive to just the letter a so it matches the edit you made to the line above. Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/a Change the MyVolume at the end to a, so it reads: Sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia -volume /Volumes/ MyVolumeįirst copy/paste this line into TextEdit. You need this line on the linked page for Terminal: Just leave the installer where it currently is in the Applications folder. It seems you already have the Mojave installer on your drive. Since you want to install Mojave, you first need an 8 GB USB flash drive. Old Toad provided a link to Apple's page, as did I. Hope this helps and good luck!Ĭreating the bootable USB drive is actually step one.
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