Urban Terror 4.1.1 for Mac and Linux file

Mac OS
Mac application: ioUrbanTerror.app
Just unzip the zip and make an alias to the ioUrbanTerror application.

Linux
Linux 32bits executable: ioUrbanTerror.i386
Linux 64bits executable: ioUrbanTerror.x86_64
You need to make it executable first: right click it, properties and tick the 'allow execution' box.