I have a Quad-core MacPro5,1 with an AMD Radeon HD 7950 video card. Are you still working on support for these older systems and are you still interested in volunteers for testing to send email to support@larian.com as directed in the thread's first post?

Caveats are that I only have a slow DSL link and I don't use GOG Galaxy so downloads average about an hour per Gigabyte.

Thanks.