There's a fine review of Catalina at Ars Technica: https://www.renderosity.com/mod/forumpro/?thread_id=2938617 Apparently, there's enough of Open GL and Open CL to run Poser. But, the versions have not been updated since Apple deprecated these back in Sierra (i think). Are there newer versions of Open GL and CL? And, if so, can the lords who own Poser devise a way to get these new versions to our OSes and get Poser to run in them, without causing any problems with the OSes or Poser?