What the Catholic Church added isn’t scripture.
It has been pronounced Scripture. You are mistaken. Where are you getting this false information?
It was all there to begin with. You may want to check the history of the Vulgate.
The first mass produced printed book was the Bible, a version based on the Latin edition from about 380 AD.. The Bible was printed at Mainz, Germany by Johannes Gutenberg from 1452 -1455.