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Unfortunately, you can only install ONE version of the display drivers at any point in time. You cannot have one driver version for the integrated GPU and a different one for the discrete GPU.
Your integrated GPU of your APU has reached peak optimisation and been moved to legacy status, it will not receive any further driver updates. More information available here.
You can download the latest Crimson 16.2.1 driver here.
You can download the last Catalyst 15.11.1 Beta driver here.