Downloading After Effects from unofficial third-party sites for "free" often exposes your system to several dangers:
Older versions like 17.1.2 lack the critical security updates found in the latest releases, leaving your computer vulnerable to exploits. Legitimate Ways to Get After Effects
While many third-party advertisements claim to offer "Adobe After Effects 2020 v17.1.2 for macOS" as a free download, these are typically unauthorized "cracked" versions that carry significant risks. Adobe does not provide older versions like 2020 (v17.1.2) for free. Risks of Unauthorized Downloads