There are a few options that you have.
1. Starfall your Wii and set the hacks so that the Wii can skip the update
2. Use the "Wii Brick Blocker" app on your computer to remove the update from the iso
3. Use GeckoOS or Gamma Loader to play the game. (This may not work because of IOS requirements)
Btw, I you haven't installed Starfall already, you should do it. And never update from 3.2. Ever.