Download the free auditing tool Go64 by St. Clair Software to scan your local drive.
Finally, the window appeared. No updates available. His Mac insisted that High Sierra was the latest and greatest.
To update macOS High Sierra 10.13.6 to macOS 10.15 Catalina, you must first ensure your hardware is compatible and your data is safely backed up. Catalina is a major transition as it . 1. Check Hardware Compatibility how to update macos high sierra 10136 to 1015
If your Mac is older than 2012, you cannot install Catalina or newer versions natively. In that case, consider staying on High Sierra or using a patching tool (not recommended for security).
Select your main hard drive (usually named Macintosh HD) as the destination. Download the free auditing tool Go64 by St
Since you are on High Sierra, the update may not appear automatically in "Software Update." You should use the method: Updating and Upgrading macOS High sierra - Apple Community
Use Time Machine or an external drive to back up everything. No updates available
Catalina requires at least , but 30–40 GB is safer.