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Windows version 10240 was the original version of Windows 10. There have been several Upgrades since then. The latest is version 17134 - 1803.
If you made a mistake when you mentioned the Windows version installed and you are on the Windows Preview Fast Track. AMD drivers are not supported on Windows versions Previews only on the current Version made for download by the general public.
The Legacy AMD Driver should work on the latest Windows 10 version 17134 or April 2018 Update.
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Adding to what elstaci already mentioned. If you are not on insider and all is as it should be. The missing CCC was a common issue fixed by running DDU and reinstalling the driver.