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Fix the “App can’t be opened because it is from an unidentified developer” on your MAC

Your Mac is normally initially set up to only allow Applications found on the App Store to install on your computer as a Security Measure.
Otherwise, it will consider the application to come from an Unidentified Developer and block installation.

To Change this:

1) Open your System Preferences

2) Select “Security and Privacy”

The package that was blocked (e.g. magicard_mac_osx_driver_v1***.pkg) may be listed here;

3) Click the padlock to make changes – choose ‘App Store and identified developers’.

If our driver package is listed here, click Open Anyway.

You can change these settings back to the App Store once our driver is successfully installed.

Further reading – Apple Article:

Open apps safely on your Mac