Do i need to use premium turbo tax if i didnt buy or sell stocks in 2017 but i have sold some in the past and used Premier Turbo Tax in 2016 for 2015, 2015 for 2014, etc.

I haven’t been doing anything with stocks for 2017 and I bought the premier back in 2015 to take care of my stock purchases and sale back then... I was wondering if I need to keep buying Premier?  Can I simply get Deluxe (lower tier) and if say in 2018, I have new stocks sold, could I simply buy Premier in 2019 for 2018?