Main files
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Unzip that into C:\Users\<your-user-folder-name-here>\AppData\Local\Larian Studios\Baldur's Gate 3\PlayerProfiles\Public\Savegames\Story
Unzip that into C:\Users\<your-user-folder-name-here>\AppData\Local\Larian Studios\Baldur's Gate 3\PlayerProfiles\Public\Savegames\Story