how do i redownload the iso? like i said i dint install using either dvd or iso, windows automatically updated my windows from 8.1 to windows 10

i dint install using dvd or iso i auto updated the windows from 8.1 to 10

windows 10 pro 32bit updated from 8.1 via auto update feature.

hi, im facing exactly the same issue, i tried turning it on from "turn windows feature on and off" option but it still gave same error. i dont know what to do :/