Is it safe to download wiimmfi whilst already having it? (DNS exploit)

I’m thinking of modding my Wii and getting retro rewind, but i think it also installs wiimmfi with it. Ive already used the DNS exploit to get it. Is it safe to get retro rewind?

Also, I originally used a library hotspot as my WiFi (our main WiFi doesn’t work with it), but they stopped using them and replaced it with “SmartSpots” which don’t even work for the Wii! -_- Are there any alternatives to the hotspot?