No change in the way that the software actually works. The Deluxe download version contains everything I need for my investments. I've had no problem entering my investment information for 2020 via download from my brokers, exactly the same process as last year.
The prompt to upgrade to Premier is most likely simply that TurboTax wants to collect more money from you. It is very annoying that TT asks me about upgrading every time I open the software to add something else to my return (and in the same way that it wants me to add another state after I've already responded that I want only one state calculation/filed because I know I do not need TT to help me file in my home state).
