At least 100 GB of free space to accommodate the installer, definitions, and database upgrades.
Wait for the confirmation prompt indicating the .zip backup file has been successfully created. symantec endpoint protection upgrade 14.2 to 14.3
If you can tell me the you have and what operating systems your clients are running , I can give you more specific advice for your environment. Share public link At least 100 GB of free space to
Upgrading Symantec Endpoint Protection from 14.2 to 14.3: The Complete Enterprise Guide symantec endpoint protection upgrade 14.2 to 14.3