Where is After Effects 2020 for an old Mac?

Just so you know in the future, the Adobe policy for all Creative Cloud apps, announced several years ago, is that only the last two major versions are supported and available for installation in the Creative Cloud desktop app. Today, that’s 2023 and 2022. After the next major versions are released (probably at Adobe MAX if history is any guide), it will be 2024 and 2023, and 2022 will be dropped from the installer.

In addition, only the last three versions of macOS are supported, which matches the Apple support policy.

So the versions of After Effects you can install on any given Mac are the last two versions. But in addition, if the Mac is so old that the latest version of macOS it can install does not meet the earliest version of macOS supported by the older version of After Effects in the Creative Cloud installer, then no version can be installed on that Mac.

You can try contacting Adobe Customer Support.

Some users have had success in getting an installation file (Make sure to sign in to your Adobe account first and allow popups and cookies on your browser. You may not be able to see the chat window if using a VPN.):
https://helpx.adobe.com/contact.html?rghtup=autoOpen will automatically open the chat window.
Type "Agent" in the chat box to bypass the chatbot and be connected to a person.

or Twitter:
https://twitter.com/AdobeCare

It's gone *poof*in the ether. Adobe no longer provides access to older versions.

Mylenium