I have recently upgraded from Reckon Accounts Premier 2013 to Reckon Accounts Premier 2019, but before doing so I copied my 2013 data files into a separate folder labelled QB 2013. I then went through the process of backing up and upgrading to 2019. I can open the files ok in 2019 , but when I go back to 2013 I get an error message stating the error code (-6000, -83). I have tried restoring the files I backed up, but I still get the error message. Can this be fixed?