“You can't use this version of the application”

Symptoms

Double-clicking FocusDragon shows: “You can't use this version of the application “FocusDragon.app” with this version of macOS.” The app never opens, and nothing is installed — no background service, no extensions, no settings.

What it means

This dialog comes from macOS, not from FocusDragon. Every Mac app declares a minimum macOS version, and macOS refuses to launch it below that line — before any of the app's own code runs. FocusDragon requires macOS 14 Sonoma or later.

FocusDragon 1.21.0 lowered this requirement from macOS 26.2 to macOS 14. If you hit this dialog on an older copy of the app, you do not need to update macOS at all — download the current version and it will open.

Check which version you're actually on

sw_vers
# ProductVersion is the number that matters — it must be 14 or higher.

Without Terminal: menu → About This Mac. The version is under the macOS name; click it if only the name is shown.

Fix

1. System Settings → General → Software Update, and install everything offered. Re-open Software Update afterwards — macOS sometimes needs a second pass to offer the next point release.
2. Re-run sw_vers and confirm ProductVersion is 14 or higher.
3. Open FocusDragon again. If you downloaded it before updating, that same copy works — you don't need to download it a second time.

Still refused on macOS 14 or later

Delete the copy you have, download a fresh one from focusdragon.app, and drag it to Applications before opening it. A download that was interrupted, or an app left inside the mounted disk image, can fail in ways that look similar.

If your Mac can't reach macOS 14, it can't run FocusDragon at all, and no reinstall will change that. Tell us — if you paid, we'll refund you in full; you should never be out of pocket for a requirement we failed to make obvious.

Still stuck? Contact us via focusdragon.app/contact (choose Support) with the output of sw_vers above.