I downloaded it to try. Retroarch emulator wouldn't launch any of my gamecube games, and it was a bit buggy with my N64 games.
I had to right click and open with Dolphin / Simple64 which worked great but opened them emulators up in another window which for me defeats the purpose of having this frontend launcher (which is so my nieces/nephew can enjoy retro titles hassle free)
Hopefully someday it's a smoother program and process that I would support. Good luck!