I have an old MacBook Air (Model Identifier: MacBookAir4,2) the hard disk got corrupted so I had to reformat it. The goal is to install High Sierra since it is the highest MacOS I can use. In order to boot the Mac, I had an old USB flash drive that can boot in Yosemite. I got an Apple location to download High Sierra but my boot disk is too small to take the download. How do I get the download to go into another larger USB flash drive so that I can download High Sierra?