macOS may block ITSDU the first time you open it because the app is not yet notarized or code-signed. You can approve it manually in Privacy & Security — it only takes a moment.
Not sure which Mac you have?
Click the Apple menu → About This Mac.
Open the downloads page
Go to the desktop downloads page.
Download the right macOS package
Download the .pkg installer for Apple Silicon, or the .dmg for Intel Macs. Both are linked above.
Open the downloaded file
Find the downloaded .pkg or .dmg in your Downloads folder and double-click it.
If macOS says the developer can't be verified
You'll see a dialog saying the app cannot be opened. Click Cancel to dismiss it — that's expected. We'll allow it through Privacy & Security in the next steps.
Open System Settings
From the Apple menu, choose System Settings (or System Preferences on older macOS).
Go to Privacy & Security
In the sidebar, scroll down and click Privacy & Security.
Find the ITSDU notice
Scroll down to the Security section. You should see a message saying ITSDU was blocked.
Click “Open Anyway”
Click the Open Anyway button next to the ITSDU notice.
Confirm with your password or Touch ID
macOS will ask you to authenticate before allowing the app to run.
Open ITSDU again
Launch ITSDU from Launchpad or your Applications folder. You're done — macOS will remember this approval going forward.
“Open Anyway” is time-limited
The Open Anyway button only appears for a short time after you first try to open the app. If you don't see it, try opening ITSDU from Applications again, then immediately return to Privacy & Security — the option will reappear.
For a .dmg or the app itself, you can also approve it directly in Finder:
The button only shows up shortly after macOS first blocks the app. Open ITSDU from Applications once more — macOS will block it again — then immediately return to Privacy & Security and the option will reappear.
That's okay. Apple menu → About This Mac will tell you what chip you have. Then download the matching build above — arm64 for Apple Silicon, x64 for Intel.
The wrong architecture may launch but run noticeably slower under translation, or fail to launch entirely.
This can happen with quarantined unsigned apps. Most often it means the download was incomplete or that macOS treats the file as untrusted because it's not notarized.
Re-download the package from the official downloads page and try the steps above. If it still fails, open a GitHub issue with your macOS version and the exact message you saw.
Managed devices often prevent unsigned apps regardless of how a user approves them. The “Open Anyway” option may be hidden by admin policy.
Try a personal Mac, or ask your device administrator to allow the app.
Stay safe
Only download ITSDU from itsdu.danielz.dev or the official GitHub releases linked from the downloads page. Don't install files shared through random links or re-uploaded elsewhere.
Open an issue on GitHub if something isn't covered here. Mention your macOS version (Apple menu → About This Mac) and exactly what message you saw.