I'm trying to install a software but I can only download from "Mac App Store and identified developers". Even after unlocking, it's greyed out and I can't make any changes. When I hover my mouse over it, it says "This option is unavailable because it's managed by your system administrator". This doesn't make sense since I'm the admin of my own computer; no one else uses my computer. I've seen other forums about changing my password, but I've tried that already to no avail. Any help would be much appreciated.
MacBook Pro with Retina display, OS X El Capitan (10.11.2)
MacBook Pro with Retina display, OS X El Capitan (10.11.2)