If you purchased the TurboTax software to install on a personal computer the TurboTax desktop editions all have the same federal forms, schedules and worksheets so there is no need to upgrade from Deluxe to Premier. The only difference in the editions is that you get more help and guidance with the higher editions.
If you want to upgrade you can do so after installing the Deluxe edition. Just click on Upgrade on the bottom right of the desktop program screen.
