That new 19.12.2 (2020 edition) doesn't work on my system Win10 x64 1903 RX480 8GB. Rolling back to the previous driver 19.12.1 which is fine...
Here you can see what exactly is happening, the driver is installed but windows can't load it. Never had this kind of issue before with any of the previous drivers. The old driver 19.12.1 still works, afrter rolling back to him