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The filename format (en-office-professional-plus-2019-x86-x64-dvd-7ea28c99.iso) indicates that this is a Volume Licensed (VL) release distributed via Microsoft’s Volume Licensing Service Center (VLSC) or a similar official channel. en-office-professional-plus-2019-x86-x64-dvd-7ea28c99.iso
You don’t need to burn it to a DVD. Modern methods are easier: en-office-professional-plus-2019-x86-x64-dvd-7ea28c99.iso