Once you get multiplayer keys (if you have to request them from GOG and can't find your old ones), you'll have to make a new character and have your new ones authorized for your account. Amia security features prevent you from logging into your account from different CD Keys.
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Login: The Copper Queen
Cromlech - The Best Copper This Side of Ruathym
Zelly Cys'dina - The Wounded Soul, Also Merchant
Aelynthi Nor'alei - The Bubbly Winged Elf
See me DM-side as:
[DM] Hlal | [DM] The Voice