I just installed Sage 50 2015 Pro.  Until now I have been using Sage 2012 Pro.  I'm having problems using my existing company file in the new version:

It seems that Sage 50 2015 Pro is having problems connecting to the 2012 Pro version's company file database.  I receive an error "Can't connect to a company database" when trying to open the SAI file in 2015 Pro.

So I then tried restoring the latest 2012 Pro backup file in Sage 50 Pro 2015 (carefully using a different company file location so it wouldn't overwrite the existing 2012 files).  In doing so I receive the following error message:

"Cannot open company file <file location>.  There is an error connecting to a database"

Any suggestions?