I believe that was explained in a prior version of the setup instructions, but is no longer included. There are very few mods capable of conflicting with the Improved Random Portraits mod, and those that do conflict will quickly correct themselves as it is considered an essential mod. Thus this mod does not conflict with the Improved Random Portraits mod. I recommend using this version(https://itch.io/t/984434/randomportraits-and-portrait-pack-editor-for-the-10-ver...) as it is more up to date.