Instead, you must use the direct download method described below.
There are two primary methods to perform the upgrade. how to update macos high sierra 10.13.6 to 10.15
Upgrading from macOS High Sierra 10.13.6 to macOS Catalina 10.15 is a straightforward process provided that hardware requirements are met and 32-bit application dependencies are resolved. By adhering to the backup protocols and utilizing the official Apple download links, users can successfully modernize their operating system environment while retaining their critical data and workflow efficiency. Instead, you must use the direct download method
macOS Catalina . Many older apps, including older versions of Microsoft Office or Adobe Photoshop, will stop working. will stop working.