I'm not talking about the W-2s specifically; I'm talking about the data you previously entered into TurboTax Online. That can be downloaded into a data file (*.tax2015) that TurboTax CD/Download can open so you can continue your 2015 return from there in CD/Download. (That option is in one of the top-level menus.) If you can't download your 2015 data file, then you would have to re-enter your data (including W-2s) in TurboTax CD/Download.
