If you specifically need version 7.4 and do not want to use the latest version (7.6), you can find archived official installers on Uptodown's Cheat Engine Version History . While these are installers rather than portable files, you can use the manual method above once they are installed.
To ensure you have a clean, safe version, the community-recommended method is to create your own "portable" folder from the official installer: cheat engine 74 portable link