So if you want to download Wiimmfi to play MKW online but don't want to DL CTGP-R (this download is a little quicker too) you can follow the following steps. A SD Card is required, and you should have at least 1 GB open to be safe.
1. Get Riivolution. You can do this by downloading this: http://adf.ly/246619/http://www.mediafire.com/download/525k67j9asffvdm/boot(2).elf
Once downloaded, rename it to boot.elf and move it to your SD card.
- Now go here and fill out this form: http://please.hackmii.com
- If you have a folder named private on your SD card, rename it.
- Check 4.3U if you're from the Americas, check 4.3E if you're European.
- You can find your Mac Address on Wii Menu -> Settings -> Internet -> Console Information
- UNCHECK the Hack Mii Installer. This is necessary.
- Fill in the captcha and cut either wire.
- Extract the downloaded folder to your SD card.
Put your SD card in your wii and go to your message board and go back a few days until you find it. Click it and install riivolution.
If you have it installed already, skip to step 2.
2. Once Riivolution is installed, download this and extract the zip to your SD card: https://mega.co.nz/#!wgkUAICb!KX9pfBXwLftfIu0eNKEx4tS35c1AhElbGKTgsAb_4ig
This will be the longest step. If you're asked to merge any folders, do so.
3. When it finishes, put your SD card in the wii and load riivolution. You should notice a menu now. HD's Retro Pack is a custom track distribution I created, but it comes with wiimmfi and you don't have to use it, but I still recommend you try it out. Here's what enabling each option does. Make sure to read all of these because some are important to your current data.
Retro Pack: If you enable this, you will load the Custom Track Pack I created with KD. With this loaded, do not join any worldwide races or else you may get banned by the wiimmfi police. If you disable this, all the normal tracks will load and you can play MKW wifi like it was before.
Wiimm-Fi: Enabling this allows you to play online, simple as that.
CTGP-R My Stuff: If you don't have CTGPR keep this disabled. If you do, you can enable this and disable the retro pack to play with custom textures / music.
Save Game on the SD Card: Keep this enabled or else it'll effect your normal MKW save on your Wii and may cause it to corrupt in some instances. It will initially take whatever licenses you currently have saved on your wii for the first time you start playing.
TT Mode: Enabling this gives you 4 new licenses to TT the retro tracks on without interrupting your normal data. It also unlocks everything whenever you create a new license. If you want to use your current FCs though, have this disabled.