It's hard to tell what's wrong, and I don't think it's something wrong with the software... The bug does not reproduce here, and I don't see any reasons why it theoretically happen. We had similar reports from other users, but the problem was with antiviruses that prevented RadioBOSS to access its settings folder. I'm not sure why they done that.
According to the error message, a simple copy operation is failing, it can't write to the settings folder. I suggest to check folder security settings: make sure the user that runs RadioBOSS has full access to the folder, also uncheck the ReadOnly attribute if it's set.