macOS Installation Guide
macOS may show a warning when you first open MIDI Mapper. This is normal for apps downloaded outside the App Store. Here's how to fix it in under a minute.
This happens because MIDI Mapper isn't notarized with Apple yet. The app is completely safe to use — it doesn't collect personal data and runs entirely on your machine.
The warning you'll see
When you first try to open MIDI Mapper, macOS will show this dialog:
"MIDI-Mapper" is damaged and
can't be opened. You should
move it to the Bin.
Safari downloaded this file today.
Don't worry — the app isn't actually damaged. Choose one of these methods to open it:
Terminal command
Most reliable — works every timeOpen Terminal
Press ⌘ Cmd + Space to open Spotlight, type Terminal, and press Enter.
Run this command
Paste the following command into Terminal and press Enter. You may be asked for your password.
If you haven't moved the app to Applications yet, drag MIDI-Mapper.app from the DMG into the /Applications folder first.
Open MIDI Mapper
That's it! Double-click MIDI Mapper in your Applications folder and it will open normally.
MIDI Mapper is ready!
Connect your MIDI controller and start mapping.
Right-click to open
No Terminal needed — but you'll confirm twiceRight-click the app
Find MIDI-Mapper in Finder (in the DMG or Applications folder). Right-click (or Control-click) it, then select Open from the menu.
Click "Open" in the confirmation dialog
macOS will show a new dialog asking if you're sure. Click Open to confirm.
macOS cannot verify the developer
of "MIDI-Mapper". Are you sure
you want to open it?
By opening this app, you are overriding system
security which can expose your computer and
personal information to malware.
You're all set
MIDI Mapper will open and macOS will remember your choice — you won't be asked again.
MIDI Mapper is ready!
Connect your MIDI controller and start mapping.