I do not have sharing of printers,,,I followed instructions as well as researched. The download completes, but when I open the program, nothing has changed. I love the 450 Turbo but have no ability to change info on Mail list so have to manually type address on label and cannot add to list. All the types of printing and sizing does not work...Is there a solution? or do I have to continue doing this. How can I get the Mac DYMO software to work?