![]() So I found a direct link which ended up opening the High Sierra page in the App Store app. ![]() I tried searching for High Sierra in the app store (on my Catalina Mac) but nothing showed up. It's my understanding that this is caused by an expired certificate. (Probably should have tried it anyway.) But I still have a copy of the "Install macOS High Sierra" app but running it gave me the "application is damage and can't be used to install" error. I didn't try the recover volume because I thought it required networking. ![]() I needed to re-install a clean copy of High Sierra on an older Mac that does not have internet access. ![]()
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