These are network errors or restrictions on your end. Since you have not provided any technical information, we can't help you further. From your name one could e.g. assume that you are in a country where Creative Cloud is not available or you could be on some Internet service provider that is not recognized as legal.
That error message is weird and misleading (if not downright incorrect). Most of the time it is because you are trying to install After Effects on a 32-bit operating system. After Effects requires a 64-bit operating system.
Trying to install AE on a 32-bit operating system pops that error message.