Install Zwitch

Open the .dmg and drag Zwitch into Applications

Double-click the downloaded Zwitch.dmg. In the window that opens, drag the Zwitch icon onto the Applications folder — like below.

Launch Zwitch and pass Gatekeeper

Open Zwitch from Applications. macOS blocks the first launch (the app isn't notarized yet). Go to

scroll down to the “Zwitch was blocked” message and click Open Anyway, then confirm with Touch ID or your password.

Follow the setup window

On first launch Zwitch opens a setup window that walks you through what to enable and where. It updates live — each step turns ✓ as you complete it.

For Accessibility: click the button in the window (or open System Settings → Privacy & Security → Accessibility), find Zwitch and turn on the toggle. If it isn't there, click “+” and pick Zwitch.

Trigger key (Fn by default)

The trigger is Fn / 🌐 by default — that's why the setup window asks you to free the Globe key. That's all you need to start.

Want a different key — Caps Lock or right ⌘? Click the Zwitch icon in the menu bar → “Settings…” and change it there.

If you switch to Caps Lock, make sure it isn't already assigned to switching input sources (Keyboard → Input Sources / Shortcuts).

Done

Tap your trigger — the layout switches instantly, cycling the languages already enabled in macOS. Launch at login is a toggle in Zwitch's settings.