Can't edit rosters after roster update

I’m trying to make a custom roster by making trades in roster management before entering Franchise.  I downloaded the roster update, but every time I try to make a trade, it says I have to download the new roster.  I want to put all of my favorite college players on the Packers, but the update seems to have made it impossible to make custom rosters, a staple to Franchise players like myself.  I’m beyond frustrated that the Madden development team can’t seem to figure this out when every other EA game has basic roster management capabilities.  Please fix this game.