help solve the problem (Borderlands 2)

donnikron
Missing game files, try reinstalling.

donnikron
It's even easier to solve the problem, just install Update 2.

You don't need to download the game again, just download Update 2 and install it, replacing all the files you need...

What kind of student downvotes the correct answers? Plused.
The author, was there not enough mind for the default cache check? If I could speak English (and it’s already 2015), I would understand the essence of the problem.