I don't have an answer, but I think the entire MyPresonus site is broken because I just registered a Studio 24c, and many of the StudioMagic plugins are not there. I don't have any access to the ones you are having trouble with in addition to: Arturia, Lexicon, Izotope, Ujam, and several others.
I opened a support ticked, which was immediately closed, then responded to it to keep it open. I opened the tickets on January 4.
I thought it might have something to do with the new year, but if you were having problems in December, that is probably not the case.
Maybe if enough people flood this topic, someone from Presonus will take notice.