I tried to do it and the game launched nicely but it does not recognize the microphone. It occurred to me that maybe I could launch the game via Homebrew channel. The most important tool for Wii development is DevkitPPC, a port of the GCC toolchain along with supporting system libraries. Did anybody install this update without no problems? These Development Tools can help you develop homebrew applications and games for the Wii. Is that possible? Above you said NO, but I red somewhere else that this specific game installs a firmware version newer than 4.3e. I don't believe that, it must be totally illegal, but I'm really afraid about Homebrew being removed.

Furthermore, it says that if don't want to accept the update then I can shutdown the Wii pressing the button 4 seconds but there is a chance that I will not be able to play the game anymore.

When I try to launch the game directly from the Wii home appears an update message that says something like 'unauthorized applications will be removed'. Today I bought the game 'We Sing UK hits' (60€ with two Logitech microphones). I bought my Wii (4.3e) recently and I've installed the Homebrew with no problems at all.

Delete wii channels