Are you saying that you have the Creative Cloud app, but it doesn't show After Effects as a possible download?
If so, your computer's hardware doesn't meet the minimum system requirements.
If that's not your problem, we will need more information.
but all software are showing but ae file not showing
Please tell me if I am correct.
You are opening the Creative Cloud software.
You see many Adobe programs to install.
You do not see After Effects.
Is that correct?
If so, your computer does not meet the minimum system requirements to run After Effects. See this page for more info: System requirements | After Effects