Radeon Software Adrenalin Edition 18.12.1 drivers have been released and they add support for Just Cause 4.
Known Issues: Some systems running multiple displays may experience mouse lag when at least one display is enabled but powered off. Assassin’s Creed: Odyssey may experience a game crash at certain locations of the game on Windows 7 enabled system configurations.
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Source: [H]ardOCP – AMD Radeon Software Adrenalin Edition 18.12.1 Drivers Have Been Released