The solution
Install upx
brew install upx
Use UPX
You can go to ‘Contents/MacOS/’ in the CORE Keygen.app and drag ‘CORE Keygen’ into the path automatically generated from the command line (the part below the command ‘-d ‘ after the command below)
sudo upx -d /Applications/CORE\ Keygen.app/Contents/MacOS/CORE\ Keygen
Open CORE Keygen.app again and it will be ready to use.
All dmg and zip open passwords shared in the article are xclient.info