Hey Michiel, I had looked over that documentation before but was not much help. I have tried many different ways to upgrade Moodle from 3.4 to 3.7 and watched many videos, most was for Linux, some said it was for Windows as well, but none of them was any help and did not look anything like what I was getting when I tried. I even did a install of 3.7 and moved the files that was described in the documentation you mentioned above, and still did not work. So I am lost.