Plugins can't be updated

I'm building a new site on a multisite network that I did not set up. None of the WPMUDev plugins will update. I also had to manually update WP to 4.8 (from 3.9) because it was not recognizing that there was an update needed. I also manually updated the WPMU Dashboard plugin.
Updates Fail from the WP plugin menu, and from the WPMU Dashboard, they refresh without doing anything.