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Plz help to update my Macos 10.13.6 to 10.15


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Thanks for reply. I try to create bootable usb with "

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --nointeraction --downloadassets --volume /Volumes/USB/" this command. Now stuck on downloading assets. Please help for get good guide for create usb and install Catalina. Thanks

 

  • 1 month later...

If you want to play it safe , first make a backup of your current installation to a removable medium.  If you have only one hard disk, make a new APFS partition/container and restore 10.13.6 to the new partition/container using disk utility from a bootable macOS installer. 

 

Then upgrade the restored copy and you should have the fully functional original to do any tweaking and downloading in case the upgrade is problematic.

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