: Users have reported success contacting Adobe Customer Support via chat and requesting a direct installer link for legacy versions like CC 2017.
: If After Effects CC 2017 (version 14.x) is still available for your account or system, it will appear in the list under "Other versions." Click Adobe Help Center Alternative Sources & Legacy Support download adobe after effect cc 2017 mac full
While the software is no longer publicly listed, you can attempt these legitimate routes to find the installer: Creative Cloud Support Policy - Adobe Help Center : Users have reported success contacting Adobe Customer