Casaubon 15 Posted June 18, 2020 What is the reason for a "is not a mod file" error when hitting install or update in the mod luancher tool? I get this error with all of my mods. If I unzip by hand the mods work just fine. I tried different zip archiving programs (peazio, 7zip, winRar) with the same outcome. Share this post Link to post Share on other sites