Not having the fastest internet on the planet, I'd rather not have to completely download the entire game + Shadowkeep when moving my account from the Activision launcher to steam. Will there be a guide from Bungie on what files can be manually moved from the current D2 installation to the Steam folder to save us having to download the entire game again?
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Nothing has been announced yet, but unlikely to be a copy/paste due to the current version requires battlenet to launch. Even some of the consoles are requiring reinstalls for shadowkeep.