Bootable installer not working
We have an independent repair shop, where we heavily rely on having bootable USB installers. Starting at the end of last week none of our drives across devices are able to install software. El Capitan, High Sierra, Catalina on iMacs, Macbook air/pro ect.
These installers have worked for years and failed at the same time.
“This copy of the install macOS High Sierra application is damaged, and can’t be used to install macOS”
We have checked and double-checked the date in terminal, so this is not the issue
Anybody have any similar experiences right now?