Where Did Alpha Curriculum 3.0 Go?

I’m coming back to the Alpha Curriculum after a couple weeks away, and the 3.0 (newest) version seems to have just up and vanished…the “Switch” button just toggles between two versions - “Alpha Curriculum” and . “Alpha Curriculum 2.0” - both of which seem to be identical to the pre-3.0 (early-November) version. Please advise ASAP.