What is the exact text of the message you are seeing?
If it's the message I'm thinking of, it is NOT prompting you to download and install CUDA.
If it's the message I'm thinking of, all it says is that it cannot use your current setup for acceleration of the ray-traced renderer. And, IF you want to accelerate the ray-traced renderer, you should install a card with CUDA.
You can't install CUDA on that card. CUDA is an NVIDIA technology.
However, it probably doesn't matter. The ray-traced renderer is considered obsolete. If you have After Effects version 12 (CC) or version 13 (CC 2014), you have a much more powerful way to render 3d in AE: details of CINEMA 4D integration with After Effects. So leave your compositions on the standard, classic renderer and don't worry about using the ray-traced renderer. More info about the GPU in AE here: GPU (CUDA, OpenGL) features in After Effects CS6 and After Effects CC |
After Effects is not prompting you to install CUDA. Read the message more carefully. It is telling you that because you don't have one of a specific set of GPUs that can use CUDA, you won't have a single feature: GPU acceleration of the ray-traced 3D renderer.
This is very different from After Effects not recognizing or using your GPU. After Effects will use this GPU for every other feature---just not the single feature mentioned above.
Details are on the page linked to from the message that you cite:
It looks like Szalam types faster than me.
thank you guys.