Before you begin, ensure your machine is compatible with macOS Catalina. According to Apple's official support documentation, the following models are supported: 2015 or later MacBook Air: 2012 or later MacBook Pro: 2012 or later Mac mini: 2012 or later iMac: 2012 or later iMac Pro: 2017 or later Mac Pro: 2013 or later (plus mid-2010/2012 models)
Once downloaded, a window titled will automatically pop up on your screen. Click Continue and accept the software license agreement.
The most significant architectural change in macOS Catalina is the . High Sierra natively supported both 32-bit and 64-bit software, but Catalina runs only 64-bit applications. Older versions of Microsoft Office (like Office 2011), Adobe Creative Cloud apps, and various older games will completely cease to function after this update. How to check for 32-bit apps before upgrading: Click the Apple menu and choose About This Mac . Click the System Report... button.
When you open an old 32-bit app, Catalina will show: “The application X needs to be updated.” There is no workaround. You must find a 64-bit replacement or keep High Sierra in a separate partition. how to update macos high sierra 10.13.6 to 10.15
Your Mac may restart multiple times and emit the startup chime. This is normal behavior. Step 6: Post-Installation Setup
At least 12.5GB of available space (up to 18.5GB if upgrading from versions earlier than El Capitan). Step 2: Prepare for the Move (The "32-bit Warning")
If you receive an error saying the installer is damaged or corrupted, it usually means the date on your Mac is out of sync with the certificate Apple used to sign the installer. Before you begin, ensure your machine is compatible
If you are using a MacBook, MacBook Air, or MacBook Pro, ensure it is plugged into a reliable power outlet. Never attempt a macOS upgrade on battery power alone. Step 3: The 32-Bit App Warning (Crucial for Catalina)
Operating system upgrades require a stable environment and sufficient storage space to execute smoothly. Clean Up Storage Space
By following these guidelines and taking the necessary precautions, you'll be able to upgrade your Mac to macOS 10.15 with confidence. The most significant architectural change in macOS Catalina
If you run into any specific errors during the download, or if you want to know how to install this via a instead, let me know! I can also help you find 64-bit alternatives for any critical software you might lose in the transition. Share public link
Approximately 15GB to 18.5GB of available disk space for the installation. 2. Critical Pre-Upgrade Steps
Your Mac will save the installation files and restart. During the installation process: