curl -O url
in Terminal to download the file. (There's an example of that in my screenshot below.)hdiutil attach -verbose
into the terminal. Add a space at the end, but don't press enter yet.Apple_APFS
or error 112
, the issue is likely legitimate incompatibility, and this disk image won't open on this Mac without an update to the operating system.hdiutil attach -verbose
output that shows an APFS error due to an older version of macOS:nvram
, turn off safe mode and have your Mac boot normally on the terminal:sudo nvram boot-args='
and press enter.