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Fullstop / Installing Fullstop, including the macOS warning

Installing Fullstop, including the macOS warning

Last updated November 2, 2026

Your Mac will block the Fullstop installer the first time you open it, with a warning that Apple "could not verify" it. That's because this early test build isn't registered with Apple yet. To install it anyway, open System Settings > Privacy & Security, click Open Anyway, and enter your password.

Before you start

Step 1: Download, then open the installer

This is an early test build. It's brand new and hasn't been tested on other Macs yet. Install it only if you have a current backup, and only if you're OK waiting 3 days for admin access if something goes wrong. If it does, please tell us what happened.

Download Fullstop.pkg

Then double-click it in your Downloads folder.

Step 2: macOS blocks it (this is expected)

You'll see a window titled "Fullstop.pkg" Not Opened. It says Apple could not verify the file is free of malware that may harm your Mac or compromise your privacy. It offers two buttons: Done and Move to Trash.

Click Done. Don't move it to the Trash.

Why macOS says this

Apple asks every developer to join its Developer Program, which costs $99 a year. Joining lets the developer sign their software and send it to Apple for an automated malware check called notarization. Software that hasn't been through that check gets this warning, whatever it is.

Fullstop is a new project in early testing, and it hasn't joined yet. The warning means "Apple hasn't checked this," not "Apple found a problem." Once Fullstop is registered, the warning goes away and this page will say so.

"Can't I just right-click and choose Open?"

Not anymore. Since macOS Sequoia (macOS 15), Apple removed the right-click shortcut for software that isn't notarized. The only way through is System Settings, below. Older guides that say "right-click, Open" are out of date.

Step 3: Allow it in System Settings

  1. Open the Apple menu > System Settings.
  2. Click Privacy & Security in the sidebar, then scroll down to Security.
  3. You'll see a line saying Fullstop.pkg was blocked. Click Open Anyway. Apple says this button only shows for about an hour after you try to open the file. If it's gone, double-click the installer again.
  4. Enter your Mac login password and confirm. The installer opens.

Step 4: Install and set up

  1. Click through the installer. It copies Fullstop's files and opens Set Up Fullstop. Nothing is locked yet.
  2. Setup explains what will change. Type lock to confirm, then enter your login password.
  3. macOS asks for your admin password once more so setup can run. That's normal.
  4. System Settings opens. Go to General > Device Management, double-click Fullstop, click Install, and enter your password. This turns on SafeSearch and the Chrome protections.
  5. Setup finishes: your account becomes a standard user. Log out and back in.

Want to check the file first?

You can confirm your download is exactly the file we published. In Terminal, run:

shasum -a 256 ~/Downloads/Fullstop.pkg

The result should be:

f89b9fda7eb973dd9d6cce1d890f8ad5c622ffd037492849805b053d6bf66512

If it doesn't match, delete the file and download it again.

If something goes wrong

Sources