Diablo 3: Reaper of souls. Problem with save data

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I'm aware that the whole game size is almost 32 gb with the Reaper of souls. I deleted the game and install it again, and now it just install 18gb. When I try to go into the menu it says "Your save data is from a previous version of Diablo III. If you continue, it will no longer work if the update is removed" I don't want to loss my data. So, do you guys know anything?
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How do I import save data into Diablo 3?
New ConsoleWhere are Diablo 3 save files?
The save files are stored in the game folder and can easily be transferred to other computers. In multiplayer, you can't save the game. Your character, its stats and items that it has equipped or carries, is saved automatically by the game as soon as you make any changes to it.Can you manually save in Diablo 3?
You don't have to manually save your game in order to pick up where you left off. Your game state (including experience you've gained, loot you've acquired, and quests you've completed) will be automatically saved as you progress and reach checkpoints.Does Diablo 3 have cross save?
You can migrate the game from Diablo 3 Crossplay using the cross-save feature. With no changes, you can move your Xbox 360 to your new control center.Diablo 3 Reaper Of souls Save Edit Xbox360;PS3;Xbox One;PS4; Tutorial 2018
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