Once compatibility is confirmed, the next phase is all about preparation. Skipping these steps is the number one cause of upgrade failures and data loss.
Below is a comprehensive guide to help you prepare for and complete this upgrade safely. 1. Check Hardware Compatibility
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
Updating from is a smart move for security and modern software compatibility—provided you don’t rely on 32-bit apps.
Enter your Mac’s administrator password to authorize the installation. Once compatibility is confirmed, the next phase is
How to Update macOS High Sierra 10.13.6 to 10.15 (macOS Catalina)
Before you begin — checklist
On High Sierra 10.13.6, you will often not see the Catalina update in the standard "Software Update" window. You must typically find it in the . Upgrade to macOS Catalina. - Apple