You may not legally download free games on the Nintendo Wii. The original Nintendo Wii still offers digital downloads for users to purchase on the Nintendo Wii’s Virtual Consoles and WiiWare game channels.
The Nintendo Wii was in Nintendo’s home country of Japan as of October of 2013. The Nintendo Wii is still available in the United States, but support for the original Nintendo Wii has ceased in favor of the newer Nintendo Wii U console. The content channels for digital games on the Nintendo Wii continue to function, but Wi-Fi support for the Nintendo Wii ended in May of 2014. Games purchased through retailers or the digital shops on the Nintendo Wii will work offline.