I am an Interior Designer and recently bought Home Designer 2016 because my client has HD 2015. When I tried to transfer my plans to the client's computer via thumbdrive and email (I tried saving, exporting as dxf, utilizing dropbox, etc), the client was not able to open the file on the 2015 version and access it. Is there a method of doing this so the client can have full access to all the features in the HD program?