I have 2 Macs, on the older one running OS 10.10.5, neither Poser 8 or 10 can access the library. I have installed Flash several times and can't access the library. My new computer, running OS 10.15.1, I tried to open Poser 10 and I get a message : The developer of this app needs to update it to work with this version of MacOS. I need advice on how to solve this problem, I really want to get it working on the new computer. Thanks.

I am having the same issue running a new MAC with the Catalina system. I remember that when I loaded Flash it said that Flash would be turned on as needed by a website. That makes me wonder...since Catalina decides when to turn it on and refers to websites, has it been associated solely with Safari and not actual programs?? I also had the developer message when I tried to run Corel Painter 2016.I am running Poser Pro 2014. I too am looking forward to using my new Mac. A short render I did with the basic figure was super fast. I think this may be one for the developer to figure out a better handshake.