Hi Adi,
I got an older version from uptodown https://whatsapp-desktop.en.uptodown.com/windows/versions#google\_vignette
You might need to go for one of the versions from late December, Whatsapp is auto updating any version that is too old. Try disabling updates in the Microsoft Store to stop WhatsApp from auto updating to the version with the echo issue.
Hope this helps,
Jay