Did you find a sketchy download link? Don't click it. Just go buy the game on Steam; it costs less than a coffee.
Many third-party sites offering a "Portable EXE" or "Setup.exe" are actually delivering malware, adware, or ransomware. That free copy of PvZ might cost you your banking details. plant versus zombie download
Here is the hard truth: Most of those links are lying. Did you find a sketchy download link