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I get a window saying the program failed to connect to the App Store server and that paid courses are unavailable. Yet after a moment the courses are back on the lists. Can I use them?

The application has a time limit for connecting with App Store. When the connection is not started in this time limit, this notice is displayed and the user can only see free courses. The application still tries to start a connection with App Store and if it succeeds, the list of courses is refreshed to contain the paid courses as well, and it is safe to buy them.