https://www.gameinformer.com/2018/11/09/the-next-major-overwatch-pc-update-will-require-you-to-reinstall-the-game

Video games take up more data today than they ever have before. If you own Overwatch on PC, you’ve probably invested a number of gigabytes to the game already, both through the installation process and through updates. You’ll have to be willing to download a few more, however, as Blizzard says that the next patch will require players to download the client over again.

“The next major patch will have some pretty fundamental changes to the game client,” Blizzard writes in a forum post. “The number of back-end changes we’re putting in is substantial enough that we can’t just patch over the current content efficiently. As a result, when the next patch comes out, the client will fully reinstall itself to handle these changes. We know that this isn’t ideal for people on metered connections, so hopefully this announcement helps you prepare for this coming update.”

That should be around 13GB, which is not, like, relatively huge or anything. But it does mean that if you’re one of those people that carefully rations out your monthly data cap due to ISP limits, there’s a 13GB download in your near future that you might not have bargained for.

Blizzard has not said when to expect the update, or what exactly it will entail, but it seems likely that it will include the announced revamps to the replay system.