conf t -> session-router -> sip-manipulation
Select some HMR and then do:
export %filename%
After that a %filename%.gz will appear under /code/imports/ directory. And you can download it via FTP/SFTP.
It is also possible to import sip-manipulation rules. Put your .gz file with the same structure to /code/imports/ , then go to conf t -> session-router -> sip-manipulation and do:
import %filename%.gz