The wiki offers two methods. Both fail for version 5. The unetbootin won't format a USB drive with enough persistent space to dist-upgrade or install OpenVAS. The step-by-step method fails in several regards - there ios now has a casper filesystem that there's not the room for. And leaving that out - since the method creates its own casper file system - still doesn't prepare a USB drive that can boot since the "default" is rejected by syslinux.
Also, there's no way to append the wiki pages to note that these methods won't work for 5, since new registrations are locked out.
I'd suggest someone should either correct the wiki, with a valid method, or at least add notice that the methods don't work for 5. Or delete those pages entirely. Wastes peoples' time as is. Makes the project look bad.