I see someone else is trying to update from 10.12.6 to the macOS 10.13. The recommendation from apple was to go to macOS High Sierra and download it etc. I tried this also, and it says 'this copy is damaged....'. This is the same response the previous user stated. Nobody from apple got back. Can you please advise how to upgrade?
iMac 21.5″, macOS 10.12
Go to the Applications Folder and see if " Install High Sierra " is located there.
If yes, drag and drop to Trash and Empty Trash
How to get old versions of macOS and verify what version this computer Qualifies to install. For Best results use Safari to commence the download as Others may not work.
Safari will open a redirect and open the Apple Store where the download can commence.
Go to the Applications Folder and see if " Install High Sierra " is located there.
If yes, drag and drop to Trash and Empty Trash
How to get old versions of macOS and verify what version this computer Qualifies to install. For Best results use Safari to commence the download as Others may not work.
Safari will open a redirect and open the Apple Store where the download can commence.
If you get a corrupted message...
Naw, it's not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
If you’re short of bandwidth or data… Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS ******* App in Applications, so expired Certificates are not expired.
Or...
Trash the Install MacsOS *******.app in Applications then restart, a new copy more recent version can be downloaded.
You should definitely try P. Phillips's suggestion- oftentimes, you just need to erase the old one and try again.
If it persists, however, try running the below command. It should download the High Sierra installer directly to your Downloads.
sudo softwareupdate --fetch-full-installer --full-installer-version 10.13.6
Additionally, using Wi-Fi or a network to do the download often causes the file to become corrupted. It's too slow. For these large files use a wired Ethernet connection and all should go well.
upgrade issue
