How to re-download the macOS Sierra Public Beta installer file Once the file is downloaded (it’s about 5 GB in size), make sure you know where it is (hint: it should be in your Applications folder). Note that if you have already installed Sierra on a Mac, you won’t be able to find the installer! However, you can re-download it by launching the Mac App Store, clicking on “Purchased”, finding the installer, and then clicking the Download button (see image below). The downloaded “macOS Sierra Public Beta” file.The OWC Dual USB Flash Drive or LaCie Porsche Design USB 3.0 Drive is perfect for this! Be sure that it’s erased and plugged into your Mac, and that it is visible on your Mac desktop. Note that this can be a USB flash drive, a small external hard disk drive or solid-state drive it makes no difference.
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