If your browser detects the downloaded zipfile as malware you need to remove the securitycheck for that, if only temporarily!
Mac OSX 10.6 or later
Download DMG installer
Download PKG installer
Linux/Unix ( or any other system with a Java10 vm installed )
Download and install Java10 from Oracle
, and make sure 'java' is accesible from the path
Execute 'java --add-modules java.xml,java.xml.bind -jar assembly64-latest.jar' . That's it :-)