You can execute the measure dump command in the CLI and save the output into a CSV file.
In the example below, the measure dump output will be saved into CSV file named me.csv.
# measure dump class inbound/localhost by time 5 1h to me.csv avg-bps peak-bps
After executing the command, the CSV file will be available in your current running directory. You can then download the file using the File Browser in the Advanced UI or FTP the file in the CLI.