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I have tried to update my iMac (21.5-inch, Mid 2011) form OS X Yosemite 10.10.5 to High Sierra 10.13.6. When I have downloaded OS and then tried to click the macOSUpd10.13.6.dmg file, there was Warning Massage appeared with "The following disk images couldn't be opened" and the reason say "corrupt image". I have many times re-download and try to open the file, but still same failed with couldn't opened. please help it.
Imac256 wrote:
When I have downloaded OS and then tried to click the macOSUpd10.13.6.dmg file, there was Warning Massage appeared with "The following disk images couldn't be opened" and the reason say "corrupt image".
That file can't be run anyway. It is an update file and can only be run on some earlier version of High Sierra, i.e. High Sierra must be installed before it can be run.
See if you can get there via this Apple document: How to get old versions of macOS - Apple Support
Imac256 wrote:
When I have downloaded OS and then tried to click the macOSUpd10.13.6.dmg file, there was Warning Massage appeared with "The following disk images couldn't be opened" and the reason say "corrupt image".
That file can't be run anyway. It is an update file and can only be run on some earlier version of High Sierra, i.e. High Sierra must be installed before it can be run.
See if you can get there via this Apple document: How to get old versions of macOS - Apple Support
rkaufmann87 Thank you for your replay! But when I tried my Imac (21.5-inch, Mid 2011, OS X Yosemite 10.10.5) can't go to start up in safe mode many times already. I don't know I can fixe it. And still same error for the download SW image can't open. Please help it.
First Trash the corrupt download and then restart in Safe Mode and restart normally and redownload.
Can you get it to start normally with the version you have installed before Big Sur?
Warning Massage with disk images couldn't be opened
