because when I try to download the trial version of Adobe After Effects does not open the page of installation ???

if you're able to install other cc programs, make sure you have a 64 bit computer.

if you're not able to install any using the cc desktop app, https://creative.adobe.com/products/creative-cloud‌, check your hosts file. 

for help with that and other common secure adobe.com connection problems read, http://helpx.adobe.com/x-productkb/policy-pricing/activation-network-issues.html