High Sierra 10.13.6 To 10.15 _best_ | How To Update Macos

Since you are jumping a full version (from 10.13 to 10.15), this is a significant update. Use Time Machine or an external hard drive to back up your files. If anything goes wrong during installation, you can restore your Mac to its previous state.

– you risk malware.

| Issue | Possible Solution | |--------|--------------------| | “This copy of the Install macOS Catalina application is damaged” | Set date back manually via terminal: date 010100002020 (then rerun installer). | | Insufficient disk space error | Free up space by deleting caches, old iOS backups, large unused apps. | | Installer hangs at “less than a minute remaining” | Wait up to 1 hour; if still stuck, restart and re-run installer from Recovery Mode. | | 32-bit app won’t open | App must be replaced with a 64-bit version or abandoned. No workaround exists. |