I heard on SEN radio during the week that they are only available if you subscribe to the ChampionData enewsletter, via the ChampionData website.
Second what Jason said, I heard that also. What usually happens though is Champ.Data will release a weekly email which has the DT scores for each team and player for the week, including challenge matches. But normally for Supercoach, we've had to wait for an excel spreadsheet to be released the week after the NAB has finished which contains the SC scores. Who knows, it might be slightly different this year, however.