If you are recovering a Mac using a Windows PC, you can use a tool like : Insert your USB drive (note that all data will be erased). Open TransMac as an Administrator.
Open and format the USB drive as Mac OS Extended (Journaled) , naming the drive Untitled . Open Terminal and paste the following command:
It is one of the last macOS versions to fully support 32-bit applications , making it essential for users who rely on older professional software that doesn't run on newer, 64-bit-only systems like Catalina.
Apple provides a hidden "link" to the High Sierra installer in the App Store for users who have previously "purchased" or downloaded it.