Openelec update using Windows

Somehow I can’t figure out how to do this again. I have a chromebox running openelec. I want to update it via my Windows computer. I have downloaded the tar. from the website. Can’t really figure out the next part. I put the ip address of the machine in search bar and all that comes up is a blank Kodi page. Can’t find the update folder to copy the tar. into? Anyone know what I’m doing wrong? I’m sure it’s something simple, thanks in advance. Windows 10.