You can’t install two copies of the same tax year version on a single computer. You can, however, enter the 2nd Licence Code into the software when you have used up the returns included with the 1st code. To do this, select Tools > Licence Code Switch from the top menu.
FYI: Unless you have bought the French version of the software, then there is no “Deluxe” version of TurboTax CD/Download. Only the online version has changed its name. If you have an English box (or order) that says “Deluxe”, then it’s for the online version.
