If you want your computer back, use this to disable the protections. In the system preferences, a new option is enabled under the security section, "Allow apps

If you want your computer back, use this to disable the protections. In the system preferences, a new option is enabled under the security section, "Allow apps downloaded from: Anywhere" > sudo spctl --master-disable > sudo defaults write /Library/Preferences/com.apple.security GKAutoRearm -bool false > :> ~/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV2 > sudo chflags simmutable ~/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV2 You may need to disable system integrity protection to do this > csrutil disable If you know what you're doing, like probably everyone here, you don't need any of this junk. I didn't need it in 1998, and I don't need it now either.