no-brainer.

I recommend notepad++, works out of the box.

https://notepad-plus-plus.org/downloads/

Just follow the installation steps once you've downloaded it.

Usually, your game resides in
You can also easily get there by clicking the gear icon on the library page of the game:

Find the following file in the folder you arrived at:


Now, make sure to not double click it, but instead open it with Notepad++

The installation of Notepad++ should've added a context menu entry to your file browser,
So just right-mouse-click the and select Edit with Notepad++

Now the most difficult part: Find the following piece of code inside the JSON file.


NOTE: Pay attention to the curly brackets and the quotes, select exactly as I do here in the screenshot:



Extra lines aren't a big deal in JSON, but commas and brackets are!

After you made sure you selected it correctly, you can safely remove this. It should end up like this:

You can now start the game without being bothered again.

The smart people will notice and comment

"But you'll have to do this again whenever the game updates, or whenever you verify the files"

YES.
That is probably true.
But ask yourself 2 things:

• Treyarch updating a game from more than 15 years ago?
  
• When is the last time you verified files for a game?

Besides, I will keep this guide online for as long as I can. So you can always repeat the steps.

Now close this guide and start the game already.
What are you still doing here?

Don't leave any likes and certainly do not favourite this guide.