You can download the latest version for a 7-day trial period through Adobe Creative Cloud.
Many sites offering "Free Download" or "Cracked" versions of 17.0.5.16 often bundle malware or unstable "portable" versions. Pros and Cons (v17.0.5.16) After Effects 2020 (ver 17.5) download? - Adobe Community
New expressions support for easier template creation. Availability & "Free" Access