Lost everything please help

Hi all, I tried to upgrade my kodi box and without backing it up, and I have wiped everything off of my MXQ pro 4K.
My Internet and link connections are both okay and stay connected, my Wi-Fi is connected and on, I am unable to download an add-on program, to enable me to have anything on. Can anyone please recommend a legal Version of fusion Etc as an addon installer, all I keep getting is “network connection error do you want to download anyway?” I apologise for any confusion with my description or dialect I am very new to kodi.
Thankyou for any replies.