When the examination becomes available (refer to your examination notes) you should be able to see it in your paper's area in Blackboard. Navigate to your examinations/assignments tab and when the examination becomes available, there will be a link that will allow you to download the examination onto your computer from Blackboard.
If you encounter any problems downloading your examination from Blackboard, contact AskOtago.
AskOtago SharePoint: Downloading an examination from Blackboard