The only official source is the owner's Patreon or the official GitHub repository. However, the portable version is often community-packaged. The safest route:
Cheat Engine’s speedhack (enabled via the "Enable Speedhack" checkbox) works flawlessly in the portable version. This is perfect for: cheat engine 7.4 portable download
Cheat Engine is an open-source memory scanner and debugger. The "Portable" version differs from the standard installer in that it does not require installation on your computer. You simply run the executable file directly. The only official source is the owner's Patreon
Key Features of Version 7.4: