can't find and install adobe after effects cs6 version

Can I ask why you need this?

CS6 is discontinued & unsupported legacyware from 2012.  Adobe removed it from Creative Cloud quite a while ago.   Unless  you previously purchased CS6 as a standalone product and have the original installation disks & valid serial number for it, there's no way to install CS6, sorry.

Creative Cloud 2014 is also discontinued & unsupported.  But you may find a direct download link for it below.  Be sure to follow the VERY IMPORTANT INSTRUCTIONS or it won't work.

https://prodesigntools.com/adobe-cc-2014-direct-download-links.html

Hope that helps, at least partially.

1 - you must have already purchased that version so you have a serial number

-Log-in to your Adobe account and click this link https://account.adobe.com/products

-your products page should have a link to download the installer

2 - if you have a serial number but you never registered so Adobe has the number, try the next link

https://community.adobe.com/t5/download-install-discussions/older-versions-pre-2020/td-p/13065324