If you are replying to Liam, you are replying to post from 15 months ago. Sky staff no longer reply or respond to posts here.
Also, had you read through the board a bit first, you would also know that Sky Go Desktop does not currently work with OSX Yosemite and above. Streaming via browser is supported though.
There is a new version of the Dekstop client starting beta trials any time now, but Sky don't give any indication of release dates.