Ultimate Edition: DLC installed, but cannot access in-game [Origin platform]

Actually, I found a solution, nevermind. The first section of this guide seemed to do the trick: https://steamcommunity.com/sharedfiles/filedetails/?id=2104780823    I did have a copy of the base game on Steam from a long time ago, long since uninstalled, but those Bioware files were likely still there, unbeknownst to me and possibly interfering. Copy/Pasting the .xml file cleared up the DLC being inaccessible.