Trouble getting Logic to recognize Serem 2 reliably and record multiple tracks at once

I finally saw serem 2 show up yesterday by deleting and reinstalling stuff a bunch but I still don't know how to definatively get the window open. And why cant I move my sound library to an SSD that had sound files on it already? Perhaps I have all the Logic sound files on it and I'm trying to move a new installation out there and it's complaining. But most of all bothering me rn is how to arm two track to record at the came time!? So frustrating. If it recognizes my MUTU M4 why cant I just arm an audio and guitar track simultaneously without messing with the settings? Please help someone...