Hi Bala,
There is no need to restart the HA, it doesn't require a restart.
After you have uploaded the updated version of HA files in the path as mentioned in DIR_NEW.
The HA will pick these files and update based on the time lag specified in the host_profile.
if you want to test this -
* put the new files in.
* wait for about an hour or so before the HA pulls the new files and updates
* then login as root, navigate to folder where you have HA files (hostctrl/exe )and execute -
saphostexec -version
you will see the details of the new version.
Regards
Deepak