Hello
@AlanC
Once the Wizard installation finishes you don't need to remove the Ethernet cable, just unplug the power plug and then replug it.
After that go back into Kodi and give it around 10-15mins till all the Addons will update and then you can use the Addons you want.
For clearing cache on Kodi you can follow the below steps:
->From the Home screen of your Box go into Settings( two cogs)>More settings>Apps>Kodi.
->Now click on Force Stop and Clear Cache.
With regard to kodi versions yes DroidBox put out its own version which is called DBMC