Which android box do you have?
I'm assuming it's connected to the internet right? If it is, you should be able to just go to the kodi website using the box & download the APK from there (xbmc will still be there for now). After it's done installing, check the new kodi to be sure everything is working. If it is, just uninstall xbmc. This is assuming that the device came preinstalled with an APK installer.
If it's not connected to the internet & the box has a USB port, & you have access to a laptop or computer, you could just download the APK from kodi & put onto a USB stick.