“Make sure you understand the difference between a clean install and a standard install before you get started,” Filipowicz and Gil report. “This process will erase whichever OS you’re currently using from your hard drive entirely. That means any files, programs, or documents you have will be deleted. To save your files, put them on an external hard drive or a cloud-based program like Dropbox, OneDrive, or iCloud. If you don’t save these important files off your computer, you will lose them.”
“Before you erase your current operating system, download macOS High Sierra from the Mac App Store,” Filipowicz and Gil report. “Create a bootable drive of macOS High Sierra…”
Read more in the full article here.
MacDailyNews Take: It’s more time-consuming, but it can be worth it if it’s been awhile since your last clean install. We’ve done it to multiple 2011 iMacs and the difference before and after is night and day!