Yes, as Tom says, we don’t really know how the Coursera subscriptions function.
But some students have reported that once they completed a course, the platform disabled their access to the assignments sometime in the next couple of weeks. You might want to check now (before August 4) that you actually still have access to the assignments in DLS Course 1 - 4.
Here’s the DLS FAQ topic about how to download assignments. Note that there is no way to do it as a “batch” process: you have to handle each assignment individually.