All original Dungeon Keeper code has been rewritten, establishing KeeperFX as a true open-source standalone game. Ownership of the original game is still and will always be required for copyright reasons. When installing KeeperFX 1.0, perform a fresh installation without overwriting any previous versions. Saved games cannot be migrated. There is a wiki that holds answers to most of the questions you may have, and we have a large and friendly discord community where we welcome all friendly new members.