Sage 50 Canada

When trying to restore a backup of the Sage Premium 50 2013 version with Sage 50 Accountants Edition 2015 I get the error that 'a file is missing'. The backup is good. I was able to send it back to client and they are able to restore it. How can I correct…

Background: I need to upgrade to Sage 50 from Simply Accounting Pro 2010. I had to do a complete reinstall on my computer and lost the Simply Accounting Pro 2010 program files. So I can no longer open up my files, but I do have the files and the back…