This is the 4399th most frequent Russian word.
версия
"Version" or "variant" of something.
Here, 'версия' refers to a 'version' or 'edition' of software or a program, meaning its different states or iterations.
Новая версия программы работает быстрее.
The new version of the program works faster.
In this sentence, 'версия' signifies an 'interpretation' or 'account' of events.
Версия событий, рассказанная свидетелем, отличается от официальной.
The version of events told by the witness differs from the official one.
Here, 'версия' is used to mean a 'variant' or 'edition' of the book that includes unique content.