The plug-ins were just not showing up yesterday. Turns out all I had to do was enable everything.
I may have just been rushing the program. I was having trouble yesterday getting everything working, possibly because it was still downloading/setting up. If you can't track it down it might be worth posting on the Feedback forum for more direct support:
Sorry for so many questions, but I'm probably still forgetting some. Which version of Skyrim? Does Steam show that the DLC are installed? What is your skyrim directory? Do you see them in your Skyrim data directory? Do they still show up on your old mod manager? What do you see in the PLUGINS page on Vortex? (screenshot?) If you navigate to %APPDATA%\Vortex (copy that directory, tap Windows key, Ctrl+V, press enter) in File Explorer, and then navigate through the skyrim or skyrimse folder, do they show in your plugins.txt file?
