Method 3: Removing the Quarantine Attribute (Terminal Solution)

Method 3: Using Terminal to Remove Quarantines (Most Reliable)

If the app still won't open, macOS may be blocking it because it is from an unidentified developer: Go to (or System Preferences). Select Privacy & Security .

The "the application xf-adesk19 can't be opened" error on macOS is primarily caused by Gatekeeper security features and compatibility issues between UPX compression and newer macOS versions. While simple overrides like the right-click method may work in some cases, the UPX decompression method provides the most reliable and permanent solution.