– you risk malware.
Spotlight or Time Machine local snapshots. Fix: Run tmutil listlocalsnapshots / in Terminal, then sudo tmutil deletelocalsnapshots / to purge them. Reboot. 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. – you risk malware