@Ayan

I understand that you are using curl to download the file with the method in this question. I think there is no easy way to resume the chunk download with curl, so I suggest you re-download the failed chunk. The only way I know is to manually specify range to continue download the data, and then combine the files.

Below is the example and instructions.

The file has 1906482 bytes.

{
            "PackageDeliveryId": "0x05d3803c258b2f86",
            "UserPackageId": "0x04f21a8d1ed59cb1",
            "SubscriptionId": "0x0400dc1d24a00cb4",
            "Name": "ICA-2017-08-08-NORMALIZEDMP-Data-1-of-1.csv.gz",
            "ReleaseDateTime": "2017-08-09T01:00:00.000Z",
            "FileSizeBytes": 1906482,
            "Frequency": "Daily",
            "ContentMd5": "b5e893743fa0e6790e9d91b22cc2b2d2"
        },

In this example, the downloading is separated into 2 chunks.

curl -k -H "Authorization: Token_" -H "Range: bytes=0-1000000" -X GET https://hosted.datascopeapi.reuters.com/RestApi/v1/StandardExtractions/UserPackageDeliveries%28%270x05d3803c258b2f86%27%29/%24value -o part1

curl -k -H "Authorization: Token_" -H "Range: bytes=1000001-" -X GET https://hosted.datascopeapi.reuters.com/RestApi/v1/StandardExtractions/UserPackageDeliveries%28%270x05d3803c258b2f86%27%29/%24value -o part2

During download part2, the download was stopped. The part2 file has only 552960 bytes.

ls -al part2
-rw-r--r--. 1 root root 552960 Aug 24 02:04 part2

You can specify the range to start at 1000001+552960 = 1552961 to continue download the failed part, and then save the data to "part2.1" file.

curl -k -H "Authorization: Token_" -H "Range: bytes=1552961-" -X GET https://hosted.datascopeapi.reuters.com/RestApi/v1/StandardExtractions/UserPackageDeliveries%28%270x05d3803c258b2f86%27%29/%24value -o part2.1

Finally, you need to merge all files.

cat part1 part2 part2.1 > ICA-2017-08-08-NORMALIZEDMP-Data-1-of-1.csv.gz

Hope this helps.