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I used and tested this method to upgrade an existing Sierra 10.12.6 and to install a new macOS High sierra in an empty partition.īefore anything make sure you backed up your data, from your SSD/HDD/USB or any-kind of storage you use.ĭo you have a problem upgrading existing Sierra, a problem like a cross circle sign when you directly upgrade from sierra to High Sierra using Apple installer ?ĭo you have a problem with your HDD driver or old SATA driver not loaded while using the official CreatInstaller method, and you do not need to buy a new SSD and stick with your old HDD ?ĭo you have a problem with OSInstall.mpkg not found and you want to find an easy way to solve it ? In this guide I will go through some steps to prepare a bootable partition or USB installer to upgrade existing macOS Sierra or install new macOS High Sierra.