The most secure way to ensure a virus-free version is to download the Cheat Engine source code as a ZIP/RAR and compile it yourself using Lazarus.
Historically, an official "Missing Setup" RAR file was available on the main site. While often hidden now, some users still access older, safe versions of this RAR through the Wayback Machine.
For those who want a completely clean, bloatware-free installer directly from the developer, joining the Cheat Engine Patreon provides a dedicated "clean" download link.