Your software can only be regarded as tool software. To put it bluntly, it is a stand-alone software. You can run on your mobile phone without networking, but updating, uploading data from the cloud and downloading data from the cloud will not work. Because the company is gone and no one maintains the update, I suggest you export the local data to other apps as soon as possible. In case the app is deleted by mistake one day, not only the data is lost, but also the download place can't be found. But others responded that they couldn't solve the problem without reading the course. There is a study group, and so are the other students in the group. When they responded to questions in the group, neither the owner nor the teacher responded.