sethw: Yes it is - but it is a zip file. When that is unzipped it contains a folder 'Payload' and in that folder the lego cube type icon Telecom_nz.bundle. It is this final bundle file that cannot be selected in 8.1.1 on my Mac. I am certain about the version of iTunes. Also the non-logo version worked fine as your instructions via the files on the unlockit.co.nz website. Thanks so much for your help.
Ok so instead of unzipping the file just remove the .zip extension. Alternately just download the Mac version and it should work.
You need to have a file called Telecom_nz.ipcc which looks like a text file, not a zip file