Apkzonar is very popular play-store alternative. I think It have a much bigger app and game selection . I've been using it for some time. You can download all latest version of apk files from http://apkzonar.com/
for free. There I have never had problems with malware, viruses.
Now you can easily download latest version of whatsapp apk file from below link...http://apkzonar.com/whatsapp-messenger-apk-download/