Running WhatsApp on Windows 7 is no longer officially supported through the standard desktop app, as the official WhatsApp desktop client now requires Windows 10.1 (64-bit version 1903) or higher. However, you can still access your chats on a Windows 7 PC by using an Android emulator to install an APK or by using the browser-based web version. Option 1: Install WhatsApp APK via Android Emulator
Since Windows 7 doesn't have a built-in "Store" for Android apps, you must use an emulator like BlueStacks or NoxPlayer to run the WhatsApp APK. How to Install WhatsApp on PC [Windows 7/8/10] whatsapp download apk install for pc windows 7