The Microsoft Store on Windows 7 is discontinued. You cannot use the Store method.
Full functionality, including calls (via the Android app version). download whatsapp pc 64 bit windows 7
For years, WhatsApp offered a dedicated desktop application specifically tailored for Windows 7. However, as technology evolves, software developers eventually phase out support for older operating systems to focus on security and performance on newer architectures. The Microsoft Store on Windows 7 is discontinued
: These versions may eventually stop working or force an update that is incompatible with Windows 7. Technical Requirements for Older Desktop Versions as technology evolves