The most reliable and practical method for using WhatsApp on High Sierra is . This browser-based interface mirrors conversations from your phone without requiring a separate desktop application. However, even this solution has nuances on an older OS.
For users who desire a standalone window (not a browser tab) and tighter integration, third-party applications bridge the gap. Two notable options exist: whatsapp for macos 10.13.6
: Using outdated software leaves your system open to exploits. The most reliable and practical method for using