The confusion surrounding versions like 10.13 stems from Apple’s transition from 32-bit to 64-bit applications:
Since the standalone app is incompatible, the most reliable method is to use a web browser. whatsapp for macos 10136
Since you can't use the standard app, here are your best options to get WhatsApp working on your Mac: 1. The Best Workaround: WhatsApp Web The confusion surrounding versions like 10
However, a workaround exists using the web-based version. whatsapp for macos 10136