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Even if you download Whatsapp messenger(.sis file), it doesn't support in Nokia Asha 308 as well as Asha 309. Before downloading Whatsapp messenger to any Smartphone or handset check your device is supported in http://www.whatsapp.com/nokia/ and S40 version in http://www.whatsapp.com/s40/ . So before downloading any software in Ovi store or any other company website. Just checkout in google, installing file is supported or not.
Try this link from your mobile browser: http://www.whatsapp.com/s40/
If you are lucky, then you can download and install for free!