I've been trying to figure this out all day. Everytime I try and install After Effects via the Creative Cloud it always freezes. Sometimes at like 5%, sometimes at 10%. I've reatarted my computer numerous times and I've unintalled and installed Creative Cloud. I'm not sure what the problem is. It sure pisses me off though lol.
Make sure that you have all Windows updates that are available.
The one thing that was causing it for me, believe it or not, was that I needed to do a clean installation of the latest Studio graphics driver from the NVIDIA website. After doing that and restarting, all was OK.