when u have slayers booted up, scroll down to option 5 or other number, may vary depending on witch version u have, look for 5)inst/upg xbmp,m$dash,apps + evox press a you will be given another set of options, look for 5-2)inst/upg xbmp,m$dash,apps + evox - retail hd press a, select yes to proceed evox should now be installing, when complete remove disc and reboot xbox. job done
also after you have rebooted your xbox, make sure your time and and date settings are correct, if they are not scroll down and enter system management then date and time settings, you will have to reboot your xbox when u have done this.