Along with what Rav has suggested above; sometimes the data files are also better off upgrading through some other version as follows:
2010 or 2011
I have all of these installed on different computers.
You must take care especially of share trading (if applicable), invoicing (if applicable) and GST (if applicable) as through all the different versions transactions can get "confused".
Let me know if I can be of assistance, I have upgraded many data files over the past 18 years..
Regards, Robyn Kelly