Update Kodi via Mac

Okay so I have just been given an android MXQ box after I set up Kodi on my auntie’s Amazon firestick and I’m trying to update Kodi to the latest version as well as install some apps, as most of the apps on this box are empty and when I download new ones they don’t work (Is this just because it needs updating?? [I hope so!]). But anyway, installing Kodi to my aunties fire stick was a very simple job on my mom’s windows PC, I’m now back at home and all I have is a MacBook and an android box, so can someone please explain to me how I do this? Or do I just delete Kodi and re install? The update button doesn’t work on the box. Sorry if this has been posted before just I’ve searched the internet for a few days now and can’t find any help at all what so ever.