How to activate OpenCL on my Radeon 6970 HD?

I installed a software of video editing that needs OpenCL but it can't be run because it says that an OpenCL capable GPU has not been found.

 

Now, I have a Radeon 6970 HD 2 GB that supports OpenCL 2, as it shows my Radeon driver panel (v16.2.1): OpenCL Version 2.0.4.0

I installed GPU CapsViewer, and it shows a different version, OpenCL 1.2:

 

GPU CapsViewer AMD 6970.png

 

I tried the 3D Demos OpenCL, but it says: "OpenCL GPU not supported on the selected platform."

 

So, how I activate OpenCL for my GPU? I looked for a driver in the AMD site but it seems that the support to OpenCL is included in the card driver... So why I can't run applications that need it?