Are you trying to install macOS Sierra from recovery or internet recovery and getting the error "An error occurred while preparing the installation. Try running this application again" ? I will show you 3 ways to fix the issue. NOTE: THIS IS A NEW ISSUE & NOT THE DATE & TIME OR CERT ISSUE! CHAPTERS BELOW
Instructions download URL
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Main article link on now to fix the macOS Sierra Recovery & Internet Recovery
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0:00 Welcome and intro
0:30 MrMacintosh.com Article link
0:40 That is the root problem of this issue?
1:53 Quick review of the 3 different ways to fix this issue
2:07 Fix Option #1 Boot to a newer version of macOS Internet Recovery
2:28 Fix Option #2 Create and boot to macOS Sierra USB Drive
3:27 Fix Option #3 Download Sierra from Apple to recovery & use it to install Sierra!
3:35 Make Sure you are connected to WIFI or Ethernet Internet
4:10 Make sure your date and time are correct in macOS terminal with the date command
5:17 Using curl to download a custom instructions txt file to follow along!
6:30 Backup your hard drive data (if needed) & Erase Macintosh HD in disk utility
8:06 Downloading Sierra InstallOS.dmg from Apple.com via curl command
9:51 Mounting the InstallOS.dmg file
10:17 Installing the InstallOS.pkg file to get access to the Install macOS Sierra app
10:47 Kicking off the macOS Sierra installer with installassistant_springboard
11:12 DONE! Walking through the fresh installer.
12:07 Thank you!
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