Fortunately, you are not locked out of using WhatsApp on your computer. You can easily access and use directly through your browser or create a dedicated, standalone web-app experience.
This method has been hailed by many Catalina users as the best way forward. One long-time Mac user from the Apple forums confirmed, "This saves the WhatsApp web as an individual application that will have its own dock icon and work exactly as the old Whatsapp. Give it a try, it's a great solution".
Make sure your Mac screen brightness is turned up. Sometimes the glare on older whatsapp web mac os 10.15.7
Since macOS 10.15.7 is no longer receiving security updates from Apple (except for critical backports), you need to be extra careful:
macOS Catalina only supports older versions of web browsers. If WhatsApp Web tells you your browser is outdated, the easiest fix is to download the latest version of Google Chrome , which continues to support Catalina users and runs WhatsApp Web perfectly. Fortunately, you are not locked out of using
If you use the method, you must ensure browser notifications are turned on.
Many people have found themselves in the same frustrating situation. A common scenario involves a perfectly functional Mac—often a mid-2012 MacBook Pro or similar—with Catalina 10.15.7. After a routine update, the WhatsApp app suddenly ceases to function, leaving the user unable to reinstall it. One long-time Mac user from the Apple forums
This workaround gives you the best of both worlds: the compatibility of the web version with the convenience of a standalone desktop application.