This seems extremely spurious. I am in the same situation as OP. The ONLY investments I have are indicated by my T5 form. The exact same investments I had last year. The difference is that this year, Turbo Tax told me I had to upgrade to premium (doubling the cost to me).
"If we detect that your tax situation requires expanded coverage depending on what your tax situation was last year, you will be prompted to upgrade." More accurately, "If we detect that we can charge you more for doing the same thing, we will."
