I was in the same boat. Took me and three friends scouring different websites and forums to put all the info together. This is after buying two regular digital codes (no refunds) and one ce digital code (no refund).

We were all legacy players too. Thankfully we figured it all out all early enough. I sole my regular key and ce key and my gf sold hers. We upgraded our accounts to ce for $20.

We were fortunate enough to break even but I can see where people were confused. Square did squat to explain this all. They finally made a post day of launch explaining all this. Too little too late for some.