If you are searching for a free, direct download of WhatsApp for Mac OS X 10.8.5 (Mountain Lion) , it is important to understand the technical and security realities before proceeding. Here is a breakdown of your options, the limitations, and why this specific combination is problematic. 1. No Official Native App for Mountain Lion WhatsApp does not offer a native desktop application for Mac OS X 10.8.5. The official WhatsApp for Mac desktop app was introduced years after Mountain Lion was released, and it requires macOS 10.13 (High Sierra) or newer . Even the older, discontinued "WhatsApp Web" wrapper apps require at least OS X 10.10 (Yosemite).