Could you please confirm if you have Full Disk Access enabled for the program?

Please click the Apple icon in the top left and select System Settings | Privacy & Security | Full Disk Access and confirm if you see the Band-in-a-Box application listed for Full Disk Access.

If you do not see the Band-in-a-Box application listed here, please click the '+' icon and navigate to your Band-in-a-Box application file.

You can then click Open to add the program to Full Disk Access.