The compiled code can be found under the
Releases tab on the
SNES9xGx's GitHub page. The latest version for Wii is 4.3.2. You can find the Channel Installer on that page as well.
Installing the Channel works like a redirect -- the same way a Shortcut icon works on your computer. It's not the actual program. If you want to use the SNES9xGx Channel, you still need to download the program to your SD/USB disk. I had this same problem initially, so I reread and followed the directions on the
WiiBrew page and I haven't had any problems since.
Hope that helps! Cheers!