How do I install the HiDPI extension to enable retina?

Mac-to-iPad Mode Only

If you are unable to click "Allow" for the HiDPI extension in Security & Privacy, macOS/Gatekeeper may be blocking it. Here are some troubleshooting steps:

1. Disable Third-Party Apps

Apps that modify mouse or trackpad behavior can interfere. Try disabling these apps before clicking "Allow":

MagicPrefs
Synergy
BetterTouchTool
HyperDock
Any other app that can modify mouse or trackpad behavior

2. Use Safe Mode

If using a hardware mouse doesn’t work, restart your Mac in Safe Mode and try clicking "Allow" again. Safe Mode disables third-party plugins.

How to Restart in Safe Mode:

For Intel-based Macs:

Restart your Mac.
Immediately press and hold the Shift key.
Release the Shift key when the Apple logo appears.
Once in Safe Mode, try clicking "Allow."
Restart your Mac normally to exit Safe Mode.

For Apple Silicon (M1/M2/M3) Macs:

Shut down your Mac completely.
Press and hold the power button until you see "Loading startup options."
Select your startup disk.
Press and hold the Shift key, then click Continue in Safe Mode.
Once in Safe Mode, try clicking "Allow."
Restart your Mac normally to exit Safe Mode.

More details: Safe Mode Guide

3. Other Methods to Try

Close the Luna Mac app and try again.
Turn off Wi-Fi and click "Allow."
Use a hardware mouse to click "Allow."