What you need to do is make a bootable USB stick using the Install macOS Sierra.app and the createinstallmedia command Is your SSD formatted as Mac OS Extended (Journaled on a GUID Partition Map if not you will need to do so to install This would just leave you in the position you were on before. It has to be pointed at a disk that has an OS on it because it is looking for an Applications folder where it can place dmg to your SSD and ran it from there at the point where it asks you to choose a disk to install it to Start the installation again and see if you So select the Disk not the indented Volume. You will find this in the 'external' section at the bottom, In the lefthand panel select the Disk of your external drive Open Disk Utility in the Applications/ Utilities folder. If it is not you will need to reformat the disk. In order to install macOS Sierra the disk needs to be formatted as Mac OS Extended (Journaled) on a GUID Partition Map. If you are not seeing your external disk as an offered destination then it may be because it is not in suitable format. Ok so when you start the installation and go through the first couple of installer windows it should allow you to choose whichÄisk you want to install, sometimes you may see one disk with a show all disk button, or sometimes you will see the icons of all disks available for installation. So i take it you have downloaded InstallOS.dmg, opened it too InstallOS.pkg and then processed that to get the Install macOS Sierra.app, in your Application folder.
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