If you purchased desktop Deluxe from Costco and installed the software on your computer, it can handle all the usual forms, and can do everything that desktop Premier can do. Desktop Premier has a bit more help and guidance, but both versions prepare the same forms.
However, as xmasbaby0 wondered, are you using Online TurboTax by mistake instead of the Deluxe desktop software? Online Deluxe is not fully-featured, and cannot prepare some forms, as opposed to desktop Deluxe which is fully-featured. So it is possible that Online Deluxe might require one to upgrade to Online Premier if you continue using the online product.
So if you were using Online Deluxe, and decide to go back to your desktop Deluxe from Costco, you may find that you no longer need to upgrade to Premier, unless you just want the additional help and guidance.
