you have to jump through way too many hoops to install this on steam in my opinion, main issue i have is you have to give your steam login info to their "downgrader" tool to make your steam copy compatible, and you can only download that tool if you have a Nexus account, not a big deal for most who own FO4 on steam as it's where most mods are. I will update my review if they ever release a version that work with steam without having to un-update your install.
