Nothing is actually stored on the client, so you won't have actually lost anything. What it sounds like is happening is your downloaded league files keep getting corrupted. There are a few different reasons that could happen but we'd need to go into some deeper troubleshooting with you to figure out what might be going on.
Please go ahead and fill out a support ticket so the tech support guys can do that troubleshooting with you.
You can do that by filling out the form
here, or by emailing us at
support@ootpdevelopments.com.
Good luck!