Apple Releases macOS Catalina 10.15.3 With Pro Display XDR Optimizations, Improvements to Multi-Stream Video Editing for 16-Inch MacBook Pro - MacRumors
Mac OS X Catalina 10.15 Bootable / Install / Upgrade - Blu Ray : Amazon.nl: Software
macOS 10.15.7 supplementary update - for a new one
Download nú macOS Catalina 10.15.5 (en verbeter zo de levensduur van de batterij) - iCreate