Validating signatures isn’t straightforward. GUI apps are limited, and command tools confusing and prone to user error.
Do you use third-party command tools? Are you using or planning to use Catalina? This explains how 10.15 changes first run checks on those tools, and their effect on all users.
Want to check whether an Installer package has been properly notarized? This new version of Taccy will do it for you.
When you can’t install what the App Store offers: solutions for downloading and installing older versions of macOS for use with Catalina.
When the Installer refuses to complete an installation package containing kernel extensions, here’s how to fix the whitelist so that installation works.
You’re running High Sierra, but SystHist reckons you installed Mojave, and have recently applied High Sierra security updates. Isn’t it wrong?
Practical tips for those intending to upgrade early, from checking compatibility, preparing workarounds, to making a copy of the installer.
An odd problem: you try running an old installer and it crashes. There’s nothing actually wrong with the installer, it’s just that the rules have changed.
macOS can update files protected by SIP without your knowledge of any update taking place, and without the event being recorded in the Install History. Here’s how it happens.
Here’s how to find out just what that last update installed, so you can remove it manually if necessary.