So what version of Catholicism is the one you consider legitimate? Who was the last legitimate pope?
Because if you are going to demand that people submit to Roman Catholicism, the only choice they have is the present one, which you also reject.
I’m not demanding anything from anyone.
There are no “versions” of Catholicism.
Have you not heard of the Apostles Creed?
Catholics believe in Sacred Scripture / the Teachings of Christ, sacred Tradition handed down by the apostles and recognized saints and also the "Magisterium" of the Church. How the Faith has been, and should be, taught.
The Pope can certainly not change scripture, nor can he change tradition. These things exist above and beyond him. There is not, nor should there, an "old form" or "present form."