The only IOS that WiiMC needs is IOS58.
A little about the Wii. Only White Wii will play burned discs, but not all white Wii will. Colored Wii, like black or red or blue will not play burned disc. Nintendo started manufacturing Wii in Nov/Dec 2009 that could not play burned disc, right around the time the black Wii was released. When you used the hackmii installer to softmod your Wii, if you could install BootMii as boot2 than you surely have a Wii that can play burned dvd.
When I used WiiMC, I stored all my movies in a folder on my PC and shared it via SMB, WiMC was great for that. Also loaded movies via usb stick with WiiMC. Now I use Kodi on a FireTV stick to watch movies, I can even put movies on a usb stick and plug it into the back of my tv and watch them that way with no additional hardware. Burning movies to disc is so old by about 10 years.