Hello, I have inherited an old MacBook Pro A1707. In the last few seconds of the OS Sierra install, this error happens - ‘An error occurred while preparing the installation. Try running this application again.’ Wondering what the solution is?
TIA
MacBook Pro (2017 – 2020)
to make a secure connection, the time on your Mac must be correct within five minutes.
if it keeps reverting to a different time-zone, that is probably not an issue, because it keeps GMT internally. If the minutes are changing, and not within five minutes of Internet time, then Apple can't check your credentials of the Apple-ID that "owns" that download.
You may haver to ERASE the drive, and take it back to the 'shipped in the box' version of macOS. ant Hern AFETER eating your new Apple-ID upgrade back to the version you want to install.
A1707 looks up to 15-in MacBook Pro 2016 or 2017, so not T2 chip. Those models shipped with 10.12 Sierra, but if there is still an Apple-ID associated with that Mac, you may have to do the WHOLE drill:
What to do before you sell, give away, trade in, or recycle your Mac - Apple Support
Tried the download about 5 times, I did change the date and time to the UK, but the time keeps reverting to a different time. Lost on any next steps, not familiar with MacBook.
Unless that is what you see after an HOUR of installation progress, it is not failing at the END of the process, but right at the beginning.
I recommend you try the download again.
Also, is the system time correct within five minutes?
OS Sierra Install Issue
