New Kodi install 17.3 – App Not Installed

Hi
I’ve just purchased a new MXQ Pro 4K Android Box but cannot get Kodi 17.3 to install completely on it, I’ve checked that Unknown sources is set to on and i’ve tried to install all the different options of .apk files but nothing works so could anyone help please as i’m completely stuck?
I also have Android 6.0 running.

Thanks
El-Prid