This usually indicates you are using the wrong Value Type. Try different types (Float, Double, or 4 Bytes). You can also use scans, where you let the value change in the game and then scan for "Increased Value" or "Decreased Value".
Cheat Engine utilizes techniques identical to administrative tools and some malware (such as injecting code into running processes and reading system RAM). Because of this, your antivirus or Windows Defender will likely flag the portable executable. You will need to add an exclusion for your specific portable folder. cheat engine 74 portable
Cheat Engine is an open-source tool designed to help you with modifying single-player games running under Windows. It does this by scanning the memory of the game process, allowing you to find specific values (like gold or health) and change them. This usually indicates you are using the wrong Value Type