I think I did everything right but obviously not. I succeeded in following way:

setup /download configuration.xml

It downloaded the "office folder" with files.

Then I ran

setup/ configure configuration xml

that is where I get the error if I had Internet connection or had enough place on the hard drive. I have both of these things but error shows up right away. Please see the following configuration.xml that I have created and please guide me for a fix:

<Add SourcePath="C:\OfficeSetup"OfficeClientEdition="64" Channel="PerpetualVL2019" AllowCdnFallback="true">
<Product ID="ProPlus2019Volume" PIDKEY="#-#-#-#-#" >
<Language ID="en-us" />
<RemoveMSI All="true" />
<Display Level="Full" AcceptEULA="TRUE" />

The "officesetup" folder is in the root of my C:\ drive which has ODT extracted folder and the configuration.xml including the "Office" folder which got downloaded successfully as explained above.

Please help me at your earliest possible. thank you with regards