Since I'm being very unpractical, I have a question.
a). Open the Homebrew Channel, load Wad Manager 1.4, leave settings as default, select IOS16-64-v257-prod.wad and install it, then restart your Wii.
b). Load the Wad Manager 1.4 again, but this time select IOS16 as the one it should use and then install cios249.wad.
c). Load IOS Downgrader 1.0 and follow any prompts until it's complete. If nothing happens and it just asks you to reboot then don't worry, your IOS files are already hackable and they don't need downgrading.
If I follow these steps on a 4.0 Wii, couldn't it solve the problem that many face for finding cIOS 249.wad and possibly all WAD Files?