How to return the tasks I have solved to my project?

Of course, thank you. Sorry for my inaccurate description. The hardware was destroyed and the old data could no longer be accessed. I am thinking more about the possibility of being able to download my data from the CODEGYM page. - Thanks very much!

Try to recover your data from that directory if it is possible. CodeGymTask folder from your old disk. And put it to the same directory in new drive, or to new location if you created the new one.