Using Download Queue Schedules
You can setup schedules for the download queue, that is, predefined dates and times when the queue will be started. This could be used for example to download files at night when there is less activity on the Internet or when the computer is not being used.
To edit Queue schedules, select "Schedule" from the Queue menu (CMD-T). The following window appears:
IMPORTANT:
Make sure you turn off the download queue before you set the Schedule feature. As well, go into the SD preferences, and into the QUEUE section, and set it like the screenshot below. This will prevent Speed Download from starting the download queue possibly before you set it in the Scheduler.