Downloading copyrighted ISOs falls into a legal gray area or outright copyright infringement depending on your jurisdiction. The safest and most ethical route is to "dump" (rip) the files from your own physical discs using a homebrewed Wii console. The Modern Standard For those using the Dolphin Emulator
(Free)
: A format designed for massive space savings and archive integrity. However, it often requires conversion back to ISO or WBFS to run reliably on original hardware. Download Wii Games Iso Highly Compressed