macOS 10.15.b4 Catalina supports the following models:
MacBook: Early 2015 or newer  
MacBook Air: Mid 2012 or newer  
MacBook Pro: Mid 2012 or newer  
Mac Mini: Late 2012 or newer  
iMac: Late 2012 or newer  
iMac Pro  
Mac Pro: Late 2013 or newer

San Jose, Calif. – Today, Apple unveiled macOS Catalina, the latest version of the advanced desktop operating system, equipped with new features, applications and powerful technologies for developers. MacOS Catalina is Replaced by popular entertainment apps: Apple Music, Podcasts and Apple TV. The new Sidecar feature Allows you to extend your Mac desktop using the iPad as a second display or high-precision input device in Mac apps for creativity. New security features protect users further, and Voice Control Allows you to Control your Mac Exclusively with voice.
“Together with macOS Catalina, completely new applications will Appear on Mac, Including standalone versions of Apple Music apps, podcasts and Apple TV,” Said Craig Federigi, senior vice president of software engineering at Apple. – Users will appreciate the opportunity to expand the workspace With the function Sidecar, providing new options for interacting With Mac applications – using the iPad and Apple Pencil. And thanks to new technologies for developers, many more third-party Mac applications will Appear in the fall. ”

Release Date : July 31, 2019.  
Version : Build 10.15.b5 (19A526h)  
Interface Language : Multilingual. 
Developer : © 2019 Apple, Inc. 
Platform  : Intel only. 
Tablet  : Not required. 
System requirements  : OS X 10.8 or later.