I have only Windows/mac license but it seems disabled, I heard Cg shaders are only unavailable for some targets but I don’t know which.
No… Custom shaders shouldn’t be restricted by license, unless your system doesn’t support shaders, usually that means your PC is quite old 
Why do you think they are disabled? Are you getting error messages or unexpected behaviour from a shader?
Do you think an ATI HD 3430 D3D 9 (8c or something like that) with the driver from late 2009 isn’t suitable for that, because I get an error while creating a new surface shader doubting the ability of my video card among other assumptions…
Post the full text of the shader, and the full text of the error message.
You know I already did and I think you replied: it’s that so called (Shader Compilation produced no resluts(Cg Crashed?)) error.
Is it the graphics card?
I may well have replied to you in another thread, but there was no indication that this thread was about the same issue. I have no idea what would cause that error, but it has nothing to do with Pro/Free. You should file a bug report.