How do I reinstall an OS X built-in app?

Question

macOS

Problems with the built-in Safari browser, is it possible to reinstall it?
My ways:
1) I use Time Machine. I select a copy for the last year, the error "Built-in applications cannot be changed" appears.
2) I found on the Internet a way to remove built-in applications. Where can I get the application itself after deletion?

Answer 1

Applications can be downloaded from apple.com
My iTunes bugged, downloaded from apple.com, installed over the existing one, the problems disappeared.
https://support.apple.com/downloads/safari

Answer 2

So "problems" with the built-in browser or does it need to be reinstalled? Are there any "problems" in the new account? Did you delete the config files? Because OS X keeps a close eye on program hashes.

Answer 3

If not a secret - what kind of "problems"? By chance, not with Google from the address bar?