The original wallets are on github.com:

https://github.com/MutexProject/mutex-gui/releases/download/0.1.1/mutex-gui-win64-v0.1.1.0-installer.zip


These wallets are on bitbucket.org:

https://bitbucket.org/astingl/mutex/downloads/mutex-win-x64-v0.1.1.0.zip

So they are probably virus/backdoors to suck your computers dry.